TELEP~HONE

EM

l I

wesrem Electric

\

Copyright, 1955 W estem Electric Company, Incorporated

\

I

Table of Contents

General Description ~ ~ ~ ~~ ~~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~. ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~~~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~ ~ ~ ~~~ ~~~ ~ ~ ~~~~ ~~ ~~~~~ Page 1

Station Apparatus

Backboard Bracket Buzzer ~~~~ ~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -~---~~~~~~~~~~-~ Condenser ~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~

Connecting Blocks ~ ~ ~~~~~~~~~~~~ ~~~

Covers~~~~ ~ ~~-~~~~~~~~~~~~~~

Fuses ~~~ ~~ ~~~~-~~~~~~ ~~~~~~~~~~~

Telephone Sets ~~~~~ ~~~~~~~~-~~~~~~ ~~~~~~~~~~

Cord & Cable Connections~ ~~~~~~~~-~~~~

Common Equipment

19,22 21 26 27 22

~~~~~~~~~~~~~~~~ 18,19,22 ~ ~~~~~~~~~ 25 ~~~~~~~~~~~~~ 3

22,23

Cabinets ~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~ ~-~~~~~~~-~~~ ~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~ 18 14 14

Individual Feature Key Telephone Units~~~~ ~~ ~~ ~ ~~~~

Multi~feature Key Telephone Units ~ ~~~~~~~~~~ ~

Ringing Arrangements ~~~~~~~~~~~~~~~~~~~~~~~~ ~ ~~~~~~~~~~~~~~~~

Power Supply ~ ~~~~~~~~~~~~~~~~~~~~~~~~

Operation

Line Circuits ~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ ~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~

Holding ~~~~~~~~~ Wink ~ ~~~~ ~~~~~~~~~ ~

Intercommunication~

Manual~

Dial ~~~~

Audible Signal ~~ ~ ~~~~~~~~~~~~~~~~~~~~~~~~~-~~~~ ~ ~ ~ ~~~~~~~~ ~

Hypothetical Installations ~~~~~~~ ~~~~~~~~~~~~~~~ ~~~-~- ~~~ ~ ~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~

16,24 24

25 25 26

26 26 26

27

Interconnections Between Units ~~ ~~~~ ~~-~ ~~-~-~~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~ ~ ~ ~~ ~ ~~~--~~~ ~~ ~ ~ ~ ~~~ ~-~ ~~ ~~~ ~ -~ ~~~~~ ~-~~ ~ ~~ ~~ ~~ ~-~~ ~ ~ ~ 31

.. Uleslern Electric

lAl

Key Telephone

System

General Description

The lAl Key Telephone System is a switching sy:;tem designed to provide a method of signaling cu~tomers stations on one or more lines from a common battery Central Office or PBX without the assistance of an attendant or operator. The lAl Key Telephone System is a revision of the lA Key Telephone System incorporating all the features available in the lA System and introducing the wink and dial intercommunicating features. The cabinet type units of the lA System are replaced by new cabinet type units with 3 instead of 5 relays per circuit, the relays being of a different type requiring less mainknance.

The lAl System permits the subscriber to utilize the following features:

a. Answer and originate calls on from one to six central office, PBX, intercommunicating or private lines.

b. Hold calls on from one to five central office or PBX Lines.

c. Answer and originate calls on ringdown tie lines and automatic tie lines between stations of Key Telephone Systems.

d. Answer and originate calls on lines to distant individual station telephone sets.

e. Answer and originate calls on manual or dial intercommunicating lines between stations of a lAl Key Telephone System.

Any single operating feature described above requires the assignment of one key of the multi· hutton key telephone sets associated with the lAl System. The multi-button sets have either four or six buttons and accordingly the features provided with one lAl System are limited to combinations of either four or less or six or less depending upon the types of telephone sets used.

The combination furnished by a given set may be varied to some extent by making suitable changes in the connection of the spade tipped leads in the sets as, for example, to convert a pick up key to a signaling key in those sets arranged for such conversion.

Some codes of telephone sets are equipped with an exclusion key which permits manual cut off of any other station or group of stations associated with a line appearing at several stations.

Table l on the following page indicates the telephone set codes and feature combinations avail­ablt• for USt~ with the lAl System. Circuit Figures l to 4 noted in Table l illustrate the differences in

wirin11: of the various sets. It should be noted as stated in information note 301 that manual sets can he obtained only by conversion of dial sets.

l

\

CIRCUIT NOTE 5: 101. PROVIDE THE KEV TELEPHONE SET IN ACCORDANCE WITH REQUIREMENTS AS INDICATED IN THE

FOLLOWING TABLE- THE CORD CONDUCTOR COLORS ARE SHOWN UNDER THE DESIGNATION Of THE TERMINALS IN THE SET, EXCEPT WHERE "DO" APPEARS WHICH INDICATES THAT THE SPADE TIP Of THE CONDUCTOR IS TAPED AND DRESSED UNDER THE TERMINAL PLATE Of THE KEY.

1 I

~- ~-- ------------------------------.--.----------,------------,----~---------~------------~-----------r--------~~----------r~~~"'----.-----------~~~~----------------------•. FEATURES PROVIDED FOR CODING TO LINE 1 TO LINE 2 TO LINE 3 TO LINE 4 TO LINE 5 TO LINE 6 SIGNALING ST:J~.~N RINGER TO EXCLUDED ~~;o6~ LAMP LEADS

OR SIGNALING OR SIGNALING OR SIGNALING OR SIGNALING CKTS. .AMI" LEADS STATIONS ";,;·,r' --STATION CONTROL KEY SIGNAL f---~-~-.-----,------,----+--+-.--.-:::BA"'Lc-r:HO-:::L-,D+-.---r--rH-c:O:-L-::Dt--r'-·--1------· HOLD HOLD OLD HOLC

1 l PI! -:::} ,.

ARRANGEMENT EXCLLAMPSS KT SET CODE CORD KEY RINGTIP OR OR RINGTIP BAL OR RING TrP BAL AOR RING TIP BAL AORRING TIP BALAOR RING TIP AOR SIG.LEADS :R~ BUSY R B RINOJI'-P BALHOLCRI.,TIFLI~E~A:; LI~E LI~E LI:E LI~EL~, H•HOLD P•PrCKUP S•SIGNAL KEY SEE BUSY I FIG SEE NOTE 301 GOOE CODE A I A A ~- ·~ SIG SIG SIG SIG

pS•CONVERTIBLE PICKUP SIGNAL NOTE LAMP : f--::·-·-- <><~I<,NATION OF TERMINALS ON KEY ANO LAMP TERMINAL STRIPS EXCEPT AS OTHERWIS.£E:-'!S.!.T~A.'.T.£E~D-'---,--,--,--r-,--,--r---r.,.--,--r---,......,-,-~,----,,---j C•CUTOFF ITURNBUTTON) 310 DIAL .. ANUAL IR IT 18 IH 2R 2Ti DO" 2H 3R 3T l DD" 3H 4R 4T DD" 4H 5R 5T DD" 5H, 6R 6T 6H IS SOR2sj SG L2(0NINO.CL R::~RTHRI ET EB ~E_H_ CR CT 1 LG 2 3 4 5 6

~--P~-Po_Po 1 1 s4iisilw s4oBAW DI4D 3 588 A R G v BK BL w·eR-R BR·GBR·YBR:_eKj_BR·BLBR-w Y·BLY-wf-- .. -· -----~---+--+-+-----4--1-----+-+--+-+----1 e-----..;==-~====----+--1---+--+ -4----+---+-----'r-------~- - f--- - t ~· --- -t- -- t ~ -- -c-- - -

~-~~====~=~~-~-~-JT+--~-2~~s~~~s~s~w~s~~~B~A~w*---J.-~D~I~~~-~3~.---+-hR~~G~~Y~t~a~K~~B~L~~w~e~R~-~R~B~R~~~~~~~~~BLB~w G~ ~BL~w-- 1 --~--e-- s~ ~BK s~L ~w Ho Po PoPO

1 f----t--.!....-+----+--+--"--+---+---~------' 5eee \

i-----~G=cp~O~P"'o"'·=Po"'2!n"=Po"'s~---!---.f.---J 3 s~;:B~ ~~4A~t ~~_ll~~~3j~~BBC R G ~ :~ :~C..~~~~~ ~~~;~~R-BK~~:R~W R-G R=~~ R-BL ____ -_-- f---+- __ ~~ ~~ ~=~-=- !;~y:: =·1·~ _ -- --c---~;~-KJ--S---BL+S---w+s---6-R+-f----i __ IH() Po Po Po Po Po I 1---f---r-r---~=- I 564BB\I;Is648A'wl---- '__o2B_A_::i:~ 8_9 __ A __ +--+f--"R'--+_G,+Y BK _B_l,_ 'II BR--R~~~ sii:YeR·BK BR:el."BFM¥~-~:'(_~BK ~:BL R-w G:Y~e'K"G-BLC..--t-- :~ 1-- -+--- --- ---- Y~Bl~~ --- f--_:::__1--f---- s-vfs::'sK~_:_BL,_ii:-_w S-BR BR

f-~~"'H=io~P=iO."=P~Oi==P~Oi==P~0~5~0~~'-i--1f-~J+---·-_-_-++-_-r_l-·-1o-5-5':64"_lC:tJBV\.W'f5'!'6:::4C"'-A'.":W+--- t---~~5_A-__ 3 ___ t--_58

_9_0_-+----l-R-t-_G--t-__ Y-t !lK __ B'= W BR R ,!!f!.:G BR·Y BR·BK BR--BL BR-W R-G R·Y R-BK R·BL _____ 1---- ____ _ __ e-- _ - -G: BL ~ -~--- ~BL y;,v - j - - - . _ S-Y S·BK S-BL S·W+S'-·_,_B_R+-------4-~

[ H0 P0 P0 P0 s0 s0 I v 1 s64Dow s64DAw D25A· 3 5B9 e: R G v BK a L w eR-R eR-G sR-Y eR BK BR-BL sR-w~ ~ ~ t R·BL G·BL iG-w Y-llL v-w ~ s-Y s-eK s-BL s-w ~

f.-~~;;P;;o;;;P;:O;;;p;:O;;;P;:b;;;P;'6;;;;:P;';6~1--i-.j__;f---.j~+-.j--+-3-f-5-6-5A_BV:: 565AAW D34A-3 589C R G . Y BK BL W BR·G BR·Y BR-6K BR·W R·G R·Y R·Bl R·W G·Y G·Bl G·W Y·BK R·13K C·BK BR·BL Y·BL Y-'N~K-13L BK·W BL·W S ~- Y S·BK S·BL S·W S·BR BR BR·F

[ Ho Po Po P6 P6 P~ j v .; v 2 s6sssw s6sBAw --t--D-3_4_A_·_3-+_!5_B_9_a __ +---+-R---t-G-+--' , " , " w " ~';;;:; "'""' ":""_.,' ,,' ,:;, ',_;~ ,. ,:;-~, •-oc C-- ·1l• ,_,, '," .~: l"'~ ' ,_, ~ '~" ':_• ,'~'-R+e ___ R+---1

~-'-H_o_P_O_p_O_p_O_p_~ __ C~-~-.j-~-.j+-.J-41-4-~5-6-5E_B_W"·5~6-5~E-A~W-:I-----~·-~D~3~-I-A~-~3-:~-5-8_9_F--:--:~R-.·G~:--__ -Y_-."B_K_~C-B-Li•-W~j-B-R~---R·LB~R-·-·GLB~R-·~~~,.W~4- •• •oc ~~ ~: __ ~-·~ ':"_~-~-~··~~,--~-~- ~·~-c=:::) A CIRCLE AROUND A COLOR ABOVf INDICATES A CORD CONDUCTOR • DO INDICATES CONDUCTORS THAT ARE TAPED

L------------'--L..-....L __ __L _ _L __ J._ __ ....L __ __r ____ __L ___ _J._j____.! ____ W_H_IC_H_IS_N_O_T_R_cE_O_U_IR_E_D_F_O_R_U_S E IN THIS SET, AND STORED UNDER THE TERMINAL PLATE OF THE KEY ________________________ _J

INFORMATION NOTES:

310. FOR MANUAL SERVICE REPLACE THE DIAL OF THE CORRE­SPONDING DIAL SET (E.G.-540BB) WITH A 958 APPARATUS BLANK AND TRANSFER THE GREEN KEY LEAD FROM TER­MINAL "F" TO TERMINAL "RR" ON THE NETWORK TO OB­TAIN THE MANUAL SET (E.G.-540BA).

302. PROVIDE "M" WIRING WHEN THE BUZZER IS TO OPERATE ON 60 CYCLE AC, AND PROVIDE "N" WIRING WHEN THE BUZZER IS TO OPERATE ON DC.

303. All CONVERTIBLE KEY POSITIONS ARE ARRANGED IN THE SHOP AS PICKUP POSITIONS. TO CONVERT A KEY POSITION FROM PICKUP (LOCKING) TO SIGNALING (NON-LOCKING). REMOVE THE SCREW DET All P-12A892 ENTIRELY FROM THE PLUNGER AT THE KEY POSITION TO BE CONVERTED. MAKE THE NECESSARY CONNECTION CHANGES AS SHOWN IN TABLE C OF THE FIGURE INVOLVED. TO RECONVERT A KEY POSITION TO LOCKING, INSERT A SCREW DETAIL P-12A892.

304. WHEN USING THE ARRANGEMENT FOR A COMMON SIG­NALING KEY FOR TWO OR THREE, PRIVATE AND INTERCOM­MUNICATING LINES AS PROVIDED FOR IN FIG. 2, THE SIXTH KEY IS CONVERTED TO NON-LOCKING AND IS USED AS THE SIGNALING KEY. THE SIGNALING IS DIRECTED TO THE "S" OR "S I" LEAD OF THE 2nd 3rd OR 4th LINE, AS REQUIRED, THROUGH THE CROSS CONNECTIONS SHOWN IN TABLE C

FOR FIG. 2. THE AUTOMATIC CUTOFF FEATURE OF THE IAI KEY TELEPHONE SYSTEM CANNOT BE USED ON A LINE CON­NECTED TO THE COMMON SIGNALING KEY.

305. TO PROVIDE FOR A STATION BUSY LAMP FOR THOSE SETS WHERE SPECIFIC PROVISION FOR THIS FEATURE IS MADE (SEE TABLE NOTE 101} THE NECESSARY CONNECTION CHANGES SHOULD BE MADE AS SHOWN IN TABLE A OF THE PROPER CIRCUIT FIGURE. FOR THE IAI KEY TELEPHONE SYSTEM IT IS NECESSARY, IN ADDITION, TO PROVIDE A IN91 DIODE (G.E. CO. OR EQUIV.) AND A MIW CORD (OR EQUIV­ALENT) AND CONNECT THEM AS SHOWN IN FIGURE, WITH THE DIODE CLOSE ENOUGH TO THE TERMINALS TO PRE­VENT IT TOUCHING THE CAN OF THE 425B NETWORK. SEE ALSO CIRCUIT DRAWING, SD-69241-0 I, FOR STATION BUSY SIGNAL.

306. PROVIDE "Y" WIRING FOR METALLIC RETURN. (METALLIC RETURN SHALL ALWAYS BE PROVIDED WHEN THE BATTERY IS NOT LOCATED IN THE SAME BLDG. AS THE KEY TELE­PHONE SYSTEM OR WHEN IT IS LOCATED IN THE SAME BLDG. AND rT IS CHARGED OVER METALLIC RETURN FEED­ERS. METALLIC RETURN SHALL ALSO BE USED ON A-C SUPPLY). PROVIDE "Z" WIRING FOR CABLE SHEATH RETURN (CABLE SHEATH RETURN SHALL ONLY BE USED WHEN THE BATTERY IS LOCALLY GROUNDED AND LOCATED IN THE SAME BLDG. AS KEY TELEPHONE SYSTEM.)

30i. SETS EQUIPPED WITH CUTOFF KEY PER FIGURE 4 ARE WIRED IN THE SHOP WITH THE G-W AND R-W LEADS FROM THE CUTOFF KEY CONNECTED TO TERMINALS "2T" AND "2R" RESPECTIVELY. AS SHOWN IN TABLE B FOR THIS FIGURE, THESE LEADS MAY BE CONNECTED BY THE INSTALLER TO OTHER "R" AND 'T' TERMINALS TO CUT OFF EXTENSION STATIONS ON LINES OTHER THAN 2. WITH THE IAI KEY TELEPHONE SYSTEM THE "A" LEAD SHOWN IN FIG. 4 CON­NECTING TO THE EXTERNAL CONNECTING BLOCK FOR LINE 2 MUST ALSO BE CONNECTED TO THE CORRESPOND­ING LINE.

30L THE RINGER SHOULD BE CONNECTED WITHOUT CON­DENSER FOR PRIVATE LINE, COMMON OR INTERCOMMUNI­CATING LINE SIGNALS EXCEPT WHERE LOCAL INSTRUC­TIONS DIRECT OTHERWISE.

30~. THE "R" AND "RR" TERMINALS IN THE TABLES A & B OF EACH FIGURE ARE ON THE TERMINAL STRIP UNLESS OTHERWISE SPECIFIED.

31 1'. THE LAMPS ARE NOT REGULARLY FURNISHED AS PART OF THE CODED SET.

31 I. BLOCKING RING P12A858 CAN BE USED TO MAKE A HOLD, PICKUP OR SIGNAL KEY INOPERATIVE.

CONNECTION OF I N91 DIODE FOR USE WITH STATION BUSY LAMP

IAI KEY TEL, SYSTEM

4258 NETWORK

SEE NOTE 30~

TOTERM.NORM SEE TABLE A OF FIGUPE INVOLVED

"' I (/)

TO SWITCH

*CONNECTIONS PROVIDED WITH SPADE TIPS

TABLE

3

•

TO LINE AND SIGNALING CIRCUITS DR TO EXCLUSION K!YS OR CUTOFF KEYS AT OTHER STATIONS

TO LINE &SIG CKT. TO LINE AND ( AUO. SIG. CONTROL l.EAI)g SIGNALING C KT TO 2ND LINl TO 5TH LINE TO LINE AND SIGNALING CKT. TO 1ST LINE TO 3RD LINE TO 4TH LINE

I I I I I I

ii: ' I 4: \ I < \ I \ I \ I \ I --;-"\ ii 4: < 4: ;;; iii

a: .... 10 a: 10 « a: .... CD a: .... CD a: a: .... 10 "' " " a:: a: a: .... a: a:

~I! ~I/ 0 0 0 0 0 a: a: a:

:0:[/ II I i; :.:I; I; II II :r I! I; I; I; rl/ It I! :.:I; I/ I; I; riJ 0 I ~I; ~L( I; "

\.

I l-c~~1i~~~~c- ( ( } •( l ) l ) , I ) I ~ I J BLOCK CD lt I I

>-,..

-- --- --- f-- ---C4A SEE NOTE 302 RINGER TERMINAL STRIP

ON KEY ,@, A r: =='+ - •>-, 7 TYPE BUZZER 1SSEr.ABLY

NO l(~h ' ON 44A BRACKET TI * -, ,,, I S-R ./\.' I f I s

R RR RT

-'-~rr-~-~ BK A -i I L I I* I* JJF' I ~D

I 1 1 -

--I -o---'-'- ------------1- _, {--1--' L __ fi C BK

_ _J L _____ f!..._ ------------- _j

SEE NOTE 301

w OFF&.. ..l_W

NORMAL I DIAL

I 7D

PUL~r/

CIA HAND SET

w w \

ft R (II

v L_

BL

~

425 B NETWORK

A* K* QL.I QG QL2

~~F *

c *./ ... s-w F ~

.. s-c -

--1 1\

RR T

~J .l r ~ J_ ~ ;sJ

f'L-.. '---~ .. \. S-R f" S-BK 9" • c CN B R

* * *,..... * SWITCH

5-BR

)---< IB N R

** * *

1, ,.. I ,..

~ HOLD

PROVIDED ONLY AS SHOWN IN NOTE 101

a: " ,.. i:i ..J 3,' " X ..J X ..J ;a ~ ..J J

~ a: " ,.. X J ' .!: &: &: 'I' I ,.. 10 CD 3: ,.. CD 10 10 10

10 CD 3: a: a: a: a: I I I I I I I c .j I I I

10 10 10 CD ttl 10 a: a: a: a: " " <) a: " " - r-- - 1- t-- 1- 1-f-- 1- 1-- >--=----

* * ~ ~

)-()M IT IH IR ZT ZH 2R 3T 3H /3RU 4T ~H ""'~ 5T SH 5R ~ 5 5 SG n IS '2s sci

I *I R * BK

'

f---<

I ~~ 1- c.~ "'"+--- ·~ 1- '+,! - ·=> 1- L. ... -l =

PICKU) KEY

= => I 2 1ST PICKUP KEY 2ND 3RD PICKUP KEY 4TH PICKUP KEY 5TH PICKUP KEY ONE TWO ! SIGNALING SIGNALING

( ( ! KEY I KfYS

!

\ \ !

\ I i

\

~ ~ I ~ ~ ~ LG I 2 3 4 5 LAMP STRIP

* * * * * * I X J CD ,.. ttl ~ a: I I I I

10 a: I CD

d) "' "' "' "' __j CORD CONDUCTORS

TO LINE AND SIGNALII CKT OR TO LAMP LEADS IN OTHER

l

l I I r

CORD CONDUCTORS

THESE LEADS ARE TAPED AND STORED UNDER TERMINAL STRIPS

TABLE A OF FIG. I

IA-IAI SYSTEM CONVERSION CONNECTIONS OF KEY AND SWitCH LEADS (SEE NOTE 309)

KEY AND SWITCH LEAD. KEY TEL SYSTEM

S-W S-G S-Y y Y- BK

lA IB IB N R

IAI IB N R M N

TABLE B OF FIG.!

RINGER CONNECTION (SEE NOTE 309)

RINGER OR BUZZER LEADS

S-R S BK R

SET RINGER USED AS LINE RINGER ON ANY LINE

SET RINGER USED AS PRIVATE LINE RINGER WITH

OR SET RINGER OR CONDENSER

BUZZER USED FOR A COMMON SIGNAL OR WITHOUT OTHER USE (5'EE NOTE 308)

CONDENSER

* * T OR R LEAD OF LINE INVOLVED

A

A K RT RR

A A RT RR

* INDICATES CONNECTIONS INSIDE SET PROVIDED WITH SPADE TIPS .

FIGURE l Key and Telephone Circuit

Arranged for Pickup, Holding, Lamps and Signaling No Convertible Keys

5

•

•

PU

7 D DIAL SEE NOTE ~01

w w

G

l

* RR r-1--1----Jijlf\, y,...-+

~I r'"O ,._-

*

61A HANDSET J R

(~_nr7~B~K---------------------r--------~

~ ~ -~

S·R f

TO STATION BUSY LAMP CIRCUIT

~

--------- --------- - ---------- -

TO EXCLUDED STATIONS

EXCLUSION KEY PROVIDED ONLY AS SHOWN IN NOTE 101

BR-R ~I HOLD

TO LINE AND SIGNALING CIRCUITS OR TOE XCLUSION KEYS OR CUTOFF KEYS AT OTHER STATIONS (WHEN (()NNECTEO TO AN I NTERCOMMVNICATI NG Ll N E Cl RCVIT WITH CODE SIGNALING CONNECT THE "S"OR "s1" LEAD TO THE ASSOCIATED LEAD IN THE INTERCOMMUNICATING CODE SIGNALING CIRCUIT.)

rTO-tST LINE TO 2ND LINE TO 3RD LINE TO 4TH LINE TO 5TH LII;E\

-I ST PICKUP KEY Z NO PICKUP KEY 3 RD PICKUP KEY 4TH PiCKUP KEY 5TH PICK liP KEY

LAMf"cSTRIP

ON 4 BUTTON

S"TS ONLY

OP SIG KEY OR SIG.KEY OR SIG.KEY

PROVIDED ~N C:NVERTI~=E-E~AB~~ C-A~O NOTE 30\ :J

BUTTON SET ONLY ·7

t--t-~ -----'--. ~ ..... +-------------------+-+--R ~----j r-t-LG:+-1 -------+-2---- -----4-3------------+-4·-------t-,5

'--tr*-4*~-----+[*-c--------+*--- --·- ----- +*·:-------·f:c*:-'

"' "' ,_ . ' 1/) 1/)

.J "' . "'

0::

"' I 1/)

a: II)

TABLE A OF FIG 2 lA -IAlSYs'fEMCONVE RSIO N ·STATION BUS:CY-"-:Scci::G:-:N--:A-:-L--::-C-::0:-:N-:-Nc:E:-::C-::T:c-10::--::N-::5--,

r----C_ONNECTION OF HOLD KEY AND SWITCH Lf AOS(SEE NOfE 309)

~~[ HOLD KEY a SWITCH-~~~ M IW

SYS. S-W S-G S-Y Y Y·BK C_O_R_D---t---,-o---t NO STATION lA 18 IB N R M '--BUSY LAMP IAI IB N R M N

WITH STATION lA SG L2 + N R M BUSY LAMP IAI IB L2+ R M N G+TONSEENOTE305

!'_T_ER~f<4.1!1AL_()!I~ • .II-£:!WOR~--------------------'

TABLE B OF FIG.2 RINGER AND EXCLUSION KEY CONNECTIONS(SEcNOTE309J

RINGER OR ~X"Ll'~lr···• XEY I B~fAEOR ,, ~~ t ;, ' . i

S·R S BK R G-·i1fi::-yi~;Y.:v,j:,~ I----;,S-;:E;;T--,-;-Wc;-H:c-E;;-N:::-;U:-:S::-;E::-;Oo;-:;A-;S;-;:;B;:R-;;IO;-;G;:;E;:;D::--t=-f-C--f-il.,1.-.!-"lnl~"r--r-~f- --;--

RINGER RINGER ON ANY LINE A K T R I oR auzuR WHEN us Eo As I WITH ---r --r--Nor TO BE PRIVATE LINE OR COND. A t<: f

I CUT OFF IN COMMON S I G. 0 R !WITHOUT -t-i RT RR 1

SfT FOSRE~TN~\~~g~ I COND "t;V!AAI I c------ WHEN USED AS BRIDGED - "* ·-:,.;-;,.:+---t----t SET RINGER RINGER ON ANY LINE A JK ET ER T R EH EB

~~ ~~l~5~ WHEN USED AS I WITH A K OFF BY PRIVATE LIN~ OR COND. ET ER RT RR EH EB

EXCLUSION ~g~MOOT~i~\~~~ !WITHOUT A A ~- SEE NOTE 308 I GOND

LINE EXCLUSION

TABLE C OF FIG.2 PICKUP SIGNALING CONVERSION

CONVERT FROM LOCKING TO NON-LOCKING OR VICE-VERSA (SEE NOTE 3031 AND CHANGE L[ADS AS FOLLOWS:

KEY LEADS NO. OF SIG. NO. OF PRIVATE KEYS AND INTER-

CONVERTED COMMUNICATING NO. OF

PICKUP KEYS FROMP.U. LINES WITH COMMON Y-BR BR S-BR BK-BR

KEYS SIG. KEY 4 3

BUTTONr-~-1--~---f S ET$ 2 I

5- - MM M X

6 ~ 4 I M M M SG_ BUTTON 3 2 - M M SG X

SET 2 3 - M X SG X

4 I 2 M X 5H SG 4 I 3 X X !IH SG

----------·c"'"c-=RD CONDUCTORS _ -· -- -·-- ---~__:_:_:::' __ =:-:::::::--::::-:=· =-==~l=~---' EXTERNAL CONNECTING~LOCK /1:,_ ~ !1-, !? I

* INDICATES CONNECTIONS IN~IDE SET PROVIDED WITH SPADE TIPS.

t SEE \\_ 1---::-... -_J; I \'-+-------'/ I \~=--......./_/ I \ I I

~ ~"" ' . .J.tPv.JI' rv/v\ ' _.J_fPv.J~ ""1

v Tc fv\ fc t; , ~~ ~ ~fv \V _ ~~\V~- \V ~}02._;~ ~t~~ TO CABLI' \TO 1ST LINE TO ZND LINE TO 3RD LINE TO 4TH LINE ____ TO 5TH I~

SHEAo~ TO LINE AND SIGNALING CIRCUIT OR TO LAMP LEADS IN OTHER SETS,

FIGURE 2 Key and Telephone Circuit

Arranged for Exclusion, Pickup, Holding, Lamps and Signaling with Individual Signaling Keys or on Private and Intercom­municating Lines with Common Signaling Key (See Note 304)

7

•

to Ll14£ !l TO ,,_ TO EXTENSION RINGER, LISTENING IN

SIG CKT STA TO LINE a SIGNA~ CIRCUITS OR TO EXCLUSION KEYS OR CUTOFF LINE CKT ,CUTOFF STATIOIIS,OR Tl 6 Rl ~ _ TABLE A OF Fl(; 4 (AUO SIG BUSY 1< HYS AT OTHER STATIONS TO LINE 8 SIG CKT (AUX. HOLDING CKT.) r IA-IAI SYSTEM CONV(R'>ION- STATION BUSY-SlG-IIIALCOIIINECTfONS -

c~l~~~l Lt:t T~:'Axr~~~~ED ~ s~~~~~~KT ;-:;:; ISTLINE J.o lN(UINE TO 3RO LINE TO 4TH LINE TOS~~N~K~ ~~c~$~T~~: ~~~ASJ~i6~~~~6~~~~~ CONNECT lOIN OF! HOLD KEY AND SWXtfl::i_LEADS (SEFE NO~OS')

~O:o-,_ "'o: ~ "'_ o- m "':;:r - o: ,_ en :5 ; ~ ~ ~ ~ ~ co cr cr ,_ ro = ;;: "' ::0 ~ ""~,_ I ----~'}, '"" '"'f'P' "'"'" ""' ' · t\' "\1 -·-- -~-----, ::;t ----~-+--+----,·--:;:- < L. _ ·,.-:\ _ L ? ~---,~~- -~ ;:; "\ KT~YL HOLD KEY8tS\IIIfCH LEADS MIW

l/ - - I [; v r ' I; I I;. I; l! ~v I; I;~ ~ 0 0 z~ ~T.lTION _If<_ IB JIL rt- R M_ - --

-f----- <r >- ~ r 8USYLAMP IAI 18 111 R M N p 1 - U) w1ht STATION· I_A_ SG- _Lz_• -_-~~~-- R- ,_M

I_ -- - 1-- - --~·- ~------------tr""----Ex:~::A~o:oo::T~~~c-K--~-'J:.f-----e:=;t::=;t=;t:J-'--l~' • ~~.== ) I -·1---. { -~Q ________ .hr::;U • ~~!~·Ml{P Oil ~:~T~~Il_K_~-· ~-- _::_-----c_N'--=====+-=-~----' ~- I ¥ ;;! ~ ~' j.- -lo>-----lo- <9 >- ~ cr! 3: :.:: .J

_J~ Q)lV~~ ~ ~I I I <!)~aJ! "' ' U) ' U) ! ._:. ;.. ;f; i;; .;: U> cr "' >- m i !I -~ f~f-- _ :;;-+--:lj-4--:;;+ -~+---"'-+--- "' - ----- - ----- - ---1---~---- -- - -1-------1-- - __ T_H_E_S_E-LEAD_S_A_R_E-TA-P-ED-8--1----+--- '' -+----+-- -1-------· - ------1- f-..-.---

TABLE B OF FIG 4

C4A RINGER

!700\AL ~-~W A~~ K

SEE NOTE NORMAL•L--~ )B~L=+--*~-<FY'y~--. 301 \~/ ~

OLI

G * RR

STOREO UNOER TERM STRIP EXCEPT AS COVERED IN TABLE * B FOOT NOTE

1-l--- ,---------------------L·---·-+r·----f--. ;t!, ...... ---+--. I .. ---+--1-----i--------t=*'-----:c·--- ~---------+-----J--#fr -· -----+----l--+----l-+--+----+--+-.. f2'-

1 "----- -- --------+--11-~

,f'_T_ ~~~_li__ EB '": 1! 111 R ~- M 1T IH 2r -+2=-H-f~2_R __ +3_T __ +3_H+3:..R_4 _4_T __ +--4=-H+4_R:.___:.__SG:.___ _____ --------1--x=-T-+-9X..:.R___,.-c:..T+.::.c:.:JR I

- --~.t:*~··~=~·~~~~f*~~~~·~~~~~~;*~"'*:+f::..J~-~f: ~f: -="l'~"~~·~~-~·::~:~:K:l=--:-~~-;!:'_ \ ~-·~~ "~~:~~(.·~;;·-···1\[:~ ' • "TL...-lr----1--~ -----f--------- .;,

EXCLUSION KEY

'-' ' a:

,..-

d

~­HOLD

0::

"' (/')~~~

----t--~

1ST PICKUP KEY

-· -----+---+--1---f----+-......., '1-· ···-- r--t------

NO PICKUP KEY 3RD. PICKUP KEY 4TH. PICKUP KEY OR SIG KEY

CONVERTIBLE SEE TABLE C a NOTE 303

·- L.

CUTOFF <EY

w ~ l...!!_tt=t.;_r::::::=t:::::::::::!UtJ __ s.-_R ___ ~--~-------------l-Q---'--.]_ SWITCH

c GN

Vi

II w

B

*

~ )--,__s_BK --------- -------- ---...J..:Co---.L.U y S-BR

I ~t_ ---+-+-----~.....4-!-------r J

I LAMP STRIP- _ __';~L[G:jl£1 =:t:·-··=::::;~2r:=======:lt~3·;:;;:;~f~l'l

CORO CONOUCTORS -"' ..J m >- m

- ------ - ------ - _.;,+-_.,_· 1-- ~---~!----- ---- 0 ----- - -U)+----- - ----­

GIA HANOSET

A> R

II BK - ----- - ----- - ----- -----

_j rl--t------L--f'r----l--------·11'\--f/..--j-------fj~p..,-j----------/-~l-----~(

SEE NOTE306l\ !1\\ jJ\ ~

r-(!rJ0I -( ~~0'-+..J ~0--.-JJ~, (,) j3~~' '- ----'--------~ '---~ !----_:____..:.___; \__~ \.....___C___:____;

TO CABLE ~ST LINE _0 2ND LINE TO 3RD LINE TO 4TH. LiNE; SHEATH TO LINE IG. CKTS.OR TO L ·~p LEADS 1111 OTHER SETS

EXTERNAL CONN BLOCK

*INDICATE> CONNECTIONS INSIDE SET PROVIDED WITH SPADE TIPS.

[

:--- ~ RtNG(R_,_EXC"i,01QN_- t:<~Y -~CUTOFF ~EY CONNECTIONS(SEENOTE 30 RINGER OR EXCLUSION CUTOFF

BUZZER KEY KEY f-----,_J,EAD LEADS LEADS

·-·- ____ S-R sfu R G-Y R·Y BK-v.IBR-R G-W R-W

WHEN USED AS :I ... *" SET BRIDGED RINGER A K T R

RINGER Q.f:I.~~-NO.,ET----+-+-+--+......,1---+-+-+--t--+--1 OR BUZZER WHEN USED WITH A K I NOT TO BE e,~nkv~~ COND. CUT OFF IN ~JG OR FOR Wf:-llcT::-H-:-cOc-U--cT+-----1---4 RT RR

SET OTHER USE I! COND A A (SEE NOTE

f--.-~-- ~~::;E:-;;D!-A~S:::--+-t-f--if-f--f--+----f-+--1~--l /

SET RINGER BRIOGED RINGER A K I ET ER T** R"" E H EB ( OR BUZZER ~NY LINE T~N ~~T X"sH~~c-I:V.:.UA-~ST':::EE:CDT---W-IT-H-+-A---4-K+---+-t----f--l--+--+----+-~

EXCLUSION LINE OR COM. COND KEY SIG OR FOR 1---+---J---4 ET ER RT RR EH EB

OTHER USE WITHOUT A A f

<sE~o~rE coNo I ~----- ~~~~~~-U~S~E~D~A~S~--r--+-+·--r-+---~~--~-+-,.-.+---*--1*

BRIDGED RINGER A K CT CR T R ()J\1 AN'f LINE WHEN USED AS BOG. LINE RINGER 11\1 PLACE OF EXTERNAL

6~TB~~~~~ ~fg~~~~N~~REY;_J~~N A ** ** T R

TO BE CUT CUTOFF KEY IS OFF BY OPERATED

0lf!E

0r X"sH~~~~iH I wiTH 1 A K LINE OR COM COND SIG OR FOR 1-----+----+--ICT FR RT RR OTHER USE WITHOUT I ( SE~O~~TE COND A A

LINE EXCLUSION OR CUTOFF EXCLUSION ON LINE I OR NOT USED =..:..:::...:,.-,1-=T--r~IR~-~~H--r-IB~----r~

EXCLUSION ON OTHER I lA KEY TEL SYSTEM T"" R*" H"* 18 t

THAN LINE 1 I IAI KEY TEL SYSTEM T** R"" H"" EB

CUTOFF ON TIP 8 RING OF ANY LINE

CUTOFF OF HEAD RECEIVER USED AS A Ll STEN lNG IN SET * * OF THE LINE INVOLVED

t REMOVE THE YELLOW CORD CONDUCTOR FROM TERMINAL 18 a TAPE a CONNECT THE BALANCE LEAD CORD CONDUCTOR OF THE LINE INVOLVED TO TERMINAL 18

t TERMINALS ON NETWORK

rABLE C OF FIG 4 PICKUP-SIGNALING CONVERSION

CONVERT KEY FROM LOCKING TO NON- LOCKING OR VICE VERSA (SEE NOTE 303) a CONNECT S-BR LEAD AS FOLLOWS.

I CONNECT 5-BR LEAD TO 4 PICKUP KEYS "' 3 PICKUP KEYS I SiGNALING KEY I SG

FIGURE 4

Arranged Key and Telephone Circuit

for Cutoff, Exclusion Pickup, Lamps and Signaling

Holding,

1l

Station Apparatus

Key Telephone Sets arc combined telephone sets which include in a single housing the switching keys, line and busy lamps if desired, subscriber set apparatus, ringer and the additional cord conduc· tors required for keys and lamps. Where more than one line terminates in a set the ringer may be connected to any one of the lines, ringers in adjacent sets or externally mounted ringers being used for the balance of the lines. If desired, the set ringers may also be used as an audible signal common to a group of lines. This feature is described in more detail on page 21 of this bulletin. The keys of the set serve to switch the talking circuit to any one line. On sets having 4 or 6 button keys the keys are equipped with a device that prohibits two keys from becoming locked when depressed simul· taneously.

Common Equipment

When line and signaling equipment for an installation is required it is provided in the form of Key Telephone Units (K.T.U.). These are small panel type units approximately 7" high varying in wtdth from 2-Y.-:" to 91;.4" wide. Two rows of key telephone units can be mounted in an apparatus cabinet consisting of a l6A Apparatus Mounting and a ll7A W Cover. The 200DW and 200EW Key Telephone Units consist of such an apparatus cabinet equipped for 3 or 4 central office or PBX Lines respectively in which line, lamp flashing, incoming common signaling and incoming line lamp time out circuits are assembled and wired. One lamp flashing and time out circuit will provide the requirements for 5 line circuits when a wink signal is provided or 6 line circuits without wink.

If 6 lines with wink are required an additional 209A Unit must be installed. Other key telephone units may be added to the units provided in the 200DW and 200EW Key T~lephone Units depending upon the operating features desired in a particular installation.

It is sometimes desirable to provide the apparatus cabinet separately to be equipped with indi­vidual feature units. The following table lists the Key Telephone Units available for use with the lAl Key Telephone System and indicates the number of each required per line, per station, per group of lines, etc.

13

INDIVIDUAL FEATURE KEY TELEPHONE UNITS

Feature Reqd.

Fuse Mounting Panel

Central Office or PBX Line Circuit

Automatic Tie Line Circuit

Ringdown Tie Line Circuit

Station Line Circuit

Dial Selective Intercom Line Ckt.

K.T.U.Code

201B

202B

203A

204A

205A

207A

Signal Ckt. for Flashing Line 208A Lamps

Lamp Flashing & Incoming Signal 209A Time Out Circuit

Hold Lamp Wink Ckt. 210A

Cent. Off. or PBX Line Circuit 213A

Manual Intercom Signal Ckt. 3A

Ringing Lamp Ckt. * llA

Common Audible Signal * l6A

Lamp Resistance Ckt. for D.C. 22 type Lamp Power Supply

Battery Feed Noise Suppression * 23A Condenser

Automatic Cut off Circuit 26B

Cut Through & Control Ckt. for 29A Automatic Cut off

lntercomm. Line Battery Feed Ckt. * 31A

# Reqd.

See Desc.

l Per C.O. or PBX line

l Per Auto. Tie Line (see description)

l Per Ringdown Tie Line

l Per Station Line

l Per 9 Station Inter­com Line

l Per 3 Intercom Stations

l Per 5 or 6 lines (see description)

l Per 5 Lines

l Per Line

l Per group for code signaling

l Per System

l Per System

l Per 2 Lamps per 3 Lines or 6 Lamps per line

l Per Line

l Per Line

See desc.

l Per Intercom Line

Panel Size

6H" X 2;i\"

7" X 3fi"

7" x 31/z"

7" X 3f%"

7" X 3fi" .7" X 5H"

7" X 31/z"

7" X 4ft"

7" x 2o/s"

7" X 4if' see desc.

see desc;

see desc.

see desc.

see desc.

see desc.

-see desc.

see desc.

* These features included in multifeature 211A Key Tel. Unit noted below.

MULTIFEATURE KEY TELEPHONE UNITS

Comm. Equip. Unit 2llA l Per System 7" X 3fi"

3 Cent. Off. or PBX lines with 212A l Per 3 Lines 7" X 9%" lamp flashing & time out ckt.

3 Cent. Off. or PBX lines with 200DW l Per 3 Lines see desc. lamp flashing & time out ckt.

4 Cent. Off. or PBX lines with 200EW l Per 4 Lines see desc. lamp flashing & time out ckt.

14

Description See Para.

A

B

c

D

E

F

G

H

J

K

L

M

N p

Q

R

R

s

T

u

v

v

DESCRIPTION OF KEY TELEPHONE UNITS

A. The 201B unit is a single panel fuse mounting for 7 fuses and 6 ground terminals with fuse terminals wired to an associated terminal panel. This unit is required where battery supply to the key telephone system is obtained from a source not always attended by a maintenance man for replace­ment of fw,es. Set> paragraph on fusing in POWER SUPPLY section of this bulletin.

B. The 202B is a single panel unit on which the apparatus for one Central Office or PBX Line circuit is mounted and wired to an associated terminal panel with soldered terminations on the wired Hide and screw type terminals for connections outside the unit. This unit is used to answer and originate calls on lines to a Central Office or PBX. A holding feature is provided which permits the suhRcriher to apply a holding bridge across a line by depressing a hold key associated with the tele­phone set and to pick up the line again after having obtained desired information or conversed on any other line associated with the system.

C. The 203A is a single panel unit on which the apparatus for one Automatic Tie Line is mounted and wired to an associated terminal panel with soldered terminations on the wired side and with screw type terminals for connections outside the unit. This unit is used when it is desired to signal auto­matically and talk on a designated tie line by removing the telephone set handset from its mounting and depressing the key associated with the tie line. No additional signaling features such as auxiliary signaling keys or lamps are required. An automatic tie line unit is also required at the distant end of the line. No hold feature is available with this circuit.

D. The 204A is a single panel unit on which the apparatus for one ringdown tie line circuit is mounted and wired to an associated terminal panel with soldered terminations on the wired side and screw type terminals for connections outside the unit. This unit is used when it is desired to signal manually and talk on a designated line. Signaling is accomplished by removing the telephone set hand­set from its mounting, depressing the key associated with the tie line and operating the signaling key associated with the tie line. The manual signaling feature permits the calling party to make use of code signaling when more than one station is connected at the distant end. A ringdown tie line circuit is required at the distant end of the tie line. No hold feature is available with this circuit.

E. The 205A is a single panel unit on which the apparatus for one Station line circuit is mounted and wired to an associated panel with soldered terminations on the wired side and screw type terminals for connections outside the unit. This unit is used when it is desired to signal and talk on a line to a distant key telephone station. When this unit is used the station at the distant end need only pick up the Handset and the station at the equipment end is automatically signalled. The station at the equip­ment end must signal with a button.

F. The 207 A is a single panel unit on which the apparatus for one dial intercomm line having access to nine stations is mounted and wired to an associated panel with soldered terminations on the wired side and screw type terminals for connections outside the unit. This unit is used for selectively dialing nine stations associated with the same intercomm line, any station of the nine being able to dial any other station. When a station key associated with this circuit is depressed and the handset is removed from its associated telephone set single digit dialing causes a spurt of ringing of one to three seconds duration at the called station. No hold feature is available with this circuit.

G. The 208A is a single panel unit on which the apparatus for providing a flashing lamp feature at three stations of a dial intercomm line is mounted and wired to an associated panel with soldered terminations on the wired side and screw type terminals for connection outside the unit. This unit is used to provide ~ flashing lamp feature at the called station of a dial intercomm line. Without this flashing feature the lamp at a called station would be lighted steady indicating only that the dial inter­comm line was in use.

15

H. The 209A is a single panel unit on which the apparatus for the lamp flashing and incoming signal time out circuit is mounted and wired to an associated terminal panel with soldered termination!! on the wired side and screw type terminals for connections outside the unit. This unit is used when flashing lamps and a time out circuit are desired at the stations of a lAl Key Telephone System, the flashing lamp indicating an unanswered condition on the line associated with the lamp and the time out circuit removing all indications of an incoming call on the line if the line is unanswered after approximately 30 seconds. If a wink signal is used for indicating a held condition this unit can provide the flashing and time out feature for five lines. Wheu the wink signal is not used the unit provides flashing and time out for 6 lines. This unit or its equivalent is required for all central office or PBX Lines.

J. The 2lOA is a single panel unit on which the apparatus for a wink signal feature is mounted and wired to an associat<.>d terminal panel with soldered terminations on the wired side and screw type terminals for connection outside the unit. If a wink signal feature is not used a held line appears the same as a busy line having its line lamp illuminated steady. With the wink feature the lamp of a hdd line is off three hundredths of a second during each second of operation giving the impression of a wink. The wink is easily distinguishable from the flashing line lamp signal of an incoming call which flashes the line lamp off one half second and on one half second during each record of operation.

K. The 213A is a panel type unit on which is mounted the apparatus and wiring for one central office or PBX Line Circuit for use as a single line common to stations of both lAl and lA Key Tele­phone systems. Apparatus is wired to associated terminal panels with soldered terminations on the wired side and screw type terminals for connections outside the unit.

L. The 3A is an angle bracket type unit on which a signaling relay Js mounted and wired to a terminal panel with soldered terminations on the wired side and screw type terminals for connections outside the unit. This unit is not designed to mount directly on the l5A or 16A Apparatus Mountings and when required must be mounted on a bracket, P-37B204, which is arranged for mounting on the 15A or l6A Mounting". The 3A Key Telephone Unit is used when both code signaling and selective signaling are desired. No auxiliary equipm~nt is required for buzzer signaling when all of the buzzers are operated either selectively or on a code ringing basis but when some of the signaling keys are used for selective buzzer operation and others are employed to operate the same buzzers on a code signal­ing basis. the .3A Key Telephone Unit or its equivalent will he required.

M. The llA is an anglt> bracket type unit on which a resistance lamp is mounted and wired to a terminal panel with soldered terminations on the wired side and screw type terminals for connections outside the unit. The resistance lamp is ust>d to prevent ringing current exceeding safe limits and to improve the performance of small ringing generators under maximum load. The resistance lamps are used to insure ringing current to other apparatus working on same supply if ringing grounds or cro,;ses occur beyond lamps of circuit in trouble. This unit. like the 3A KTU must be mounted on hinged bracket 37B:204 when it is desired to mnu nt the unit on the 1 SA or l6A Apparatus Mountings with panel type key telephone units.

N. The l6A is an angiP bracket type unit on which the apparatus for an audible signal control circuit is mounted and wired to a terminal panel with soldered terminations on the wired side and screw type terminals for conneetions outside the unit. This unit. like the 3A KTC must be mounted on hinged bracket 37B204 when it is desired to mount the unit on the l5A or l6A Apparatus Mountings with panel type key telephone units. The audible signal control unit is used when two independent common audible signals are required with one or more line circuits common to two lines or common to separate groups of lines.

P. The 22 Type Key Telephone Units are of the angle bracket type with resistances mounted and wired to a terminal panel with soldered terminations on the wired side and screw type terminals for connections out-;ide the unit. These units are required when DC power or ·t8 volt batterv over

16

feeders is used to illuminate lamps. The following table indicates the lettered code of 22 type units that should be used for various conditions:

Type of Battery Supply

FOR SIA LAMPS Local battery 9 cells l·i-20V 9 Cell building battery l6-22V 10 Cell building battery l8-24V ll Cell building battery 20-26V 2:::1 Cell regulated cent. off. battery 41.5-SOV

FOR K2 LAMPS 23 Cell regulated cent. off. battery 47 . .'i-SOV

Type of KTU Req'd.

22F 22:G 22H 22J 22K

22]

The~C' units like the 3A 1\:TC must be mounted on bracket P37B204 when it is de~ired to mount the units on lSA or 16A Apparatus Mountings.

Q. The 2:3A is an angle bracket type unit on which a condenser i,; mounted and wired to a terminal panel with soldered terminations on the wired side and screw type t<'nninals for connection=­outside the unit. The condenser is wired across the key telephone sy ,;tt'm battery supply when the source is poorly filtererl or when noise caused by switching opnations in the system is objectionable. This unit, like the 3A KTU must be mounted on bracket. P-:nB20-L when it is desired to mount the unit on 15A or 16A Apparatus Mountings with panel type key telephone units.

R. The 26B and 29A are angle bracket type units on which the relays are mounted and wired to terminal panels with ~oldered terminations on the wired ~ide and screw type terminals for connec­tions outside the units. Combinations of the 26B and 29A Key Telephone (Tnits are used to provide automatic cut off of stations associated with an individual line appearing at several stations. Four optional arrangements can be provided as follows:

1-A 2--A 3-A ,j, -~-A

station station station station

can cut-off others and can not be cut off. can cut-off others and can be cut-off except during a call. or group of stations cannot cut-ofT others and can be cut-off except during a call. cannot cut-off others and can lw cut-off at any time.

The Key Telephone Units required to provide the ahove conditions are respectively as follows:

1-One 26B Key Tel. l nit per line and one 29A Key Tel. Unit per station 2- One 26B Key Tel. Unit per line and one 29A Key Tel. Gnit per station 3 --One 26B and one 29A Key Tel. Unit per line and one 29A Key Tel. Unit per station or

groups of stations 4 -----!\one --This condition applicable only to one of tlw >'lations that can he cut off in accordance

with condition~ 1. 2. :3. above.

The 26B and 29A Key TC'lephone Units like the 3A KTll must he mounted on a bracke• P-37B204 when it is de;ireJ to mount the units on 15A or 16A Apparatus Mountings with panel type key tele­phone units.

When th(' automatic cut-off feature is required with a dial intercomm line it is provided by furnish­ing one 26U Kry Tel. l_lnit per line which in conjunction with a 203A Key Telephone l-nit automati­cally cuts off all other stations on the line and reconnects only the called station to the calling station.

S. The ::11A is an angle bracket type unit on which a battery feed rela) is mounted and wired to a terminal pand with ~oldered terminations on the wired side and 5CTew type terminals for connec· tions outside the unit. Thi~ unit is used to light busy lamps steady at stations on a manual intercomm line. The 31A KTU like the 3A KTU must be mounted on a bracket P-37B20J 11 hen it j,; desired to mount the unit on 15A or 16A Apparatus Mountings with panel type units.

17

T. The 211A is a single panel unit on which apparatus for the manual intercomm signaling ckt, the common audible signal control circuit, the ringing lamp circuit, the battery feed noise suppres· sion circuit and the intercomm battery feed circuit is mounted and wired to an associated terminal panel with soldered terminations on the wired side and screw type terminals for connections outside the unit. This unit provides all of the features cov ered by paragraphs K, M, P and R.

U. The 212A Key Telephone Unit is a single pan el unit on which is mounted the apparatus and wiring for three Central Office or PBX Line circuits and flashing and time out circuit apparatus com­mon to the three lines. This common apparatus will accommodate 5 lines. Apparatus is wired to associated terminal panels with soldered terminations on the wired side and screw type terminals for connections outside the unit.

V. The 200DW and 200EW Key Telephone Units are packaged units mounted and wired in a cabinet consisting of a l6A Apparatus Mounting and a 117 A W Cover with equipment for 3 or 4 Central Office or PBX Lines respectively. The 200DW unit consists of the 212A Unit mounted in a cabinet. The 200EW unit consists of the 212A unit plus a ·202B unit mounted in a cabinet. Adequate space is available in the cabinet for units required to complete a key telephone system in .which addi­tional lines or additional operating features are desired.

CABINETS AND MOUNTING ARRANGEMENTS Cabinets per Figure 5 are available for housing the panel type key telephone units of the 200

series. The 200DW and 200EW Key Telephone Units are assembled units mounted and wired in a cabinet since it is expected that a high percentage of lAl Key Telephone System installations will require one of these basic units. Cabinets consisting of a l6A Apparatus Mtg and a 117 A W Cover are part of the 200DW and 200EW Units or can be ordered separately when desired.

18

16A Apparatns Mounting on Metal Stand ED-95023-70 Groups 2 & 4

16A Apparatus Mounting and 117AW Cover on Metal Stand ED-95023-70 Groups 2 & 4

FIGURE 5

Extension ED-95023-70 G-6

Foot ED-95023-70 C-2

FIGURE 6

Cover ED-95023-70 G-4

The assembly of the 16A Apparatus Mounting includes a wood backboard which serves to insulate the cabinet from any surface on which it is mounted. When it is desirable to mount the cabinet on the floor a floor stand, ED-95023-70 Group 2, can be used and where appearance is a factor a cover for the base of the stand, ED-95023-70 Group 4 can be provided. One floor stand foot and cover are shown in Figure 6. One ED-95023-70 Group 2 and 4 is required to provide the two foot assemblies and covers neces3ary to support one cabinet.

The 16A apparatus mounting and cover have overall dimensions of 26 1~" x 16-it;" x 9%". The cover has a beige gray wrinkle finish and is furnished with an inner lining of sound absorbent material for noise reduction purposes. The apparatus mounting has a hinged gate assembly affording easy access to the terminal side of mounted apparatus, the gate assembly providing two rows of mounting space each 7" high {see Fig. 7) each row having horizontal space available for any number of key telephone units with a total horizontal requirement of 21 1~" or less.

19

co .... ' ft.

200EW Key Telephone Unit with an Additional 202B Key Telephone Unit (Cabinet Cover Removed)

FIGURE 7

II •u

The gate assembly is also arranged for mounting six 2" x 23" apparatus mounting plates which permits a combination of panel type and mounting plate type units to be mounted in the same cabinet. The shorter 19" mounting plates may be mounted in the cabinet by using adapters per P-36B209. Two adapters are required for each plate to be mounted.

For small installations of panel type key equipment units a smaller cabinet consisting of a 173A Backboard, a 15A Apparatus Mounting Assembly and ll6A W Cover is available. This cabinet is 16%" high and l3:lV' wide and 9%" deep. The apparatus mounting assembly provides two rows of mount· ing space each 7" high, each row having horizontal space available for any number of key telephone units with a total horizontal requirement of lOTt; inches. Although the cabinet is primarily intended for wall mounting and not arranged for floor support, the floor stand ED-95023-70 Groups 2 and 4 can be used by drilling the cabinet backboard as required.

20

Small individual angle bracket type key telephone units such as the 3A, 11A, 16A, 31A, (Fig. 8) etc. can be mounted on the 15A or 16A apparatus mounting by using a mounting bracket assembly P37B204. Using this assembly three single space or one double space and one single space key telephone units of the angle bracket type can be mounted on the front and rear of the bracket.

Extension auxiliary uprights, ED-05023-70 Group 6 can be provided when it is desirable to mount the l01G Power Plant on the same stand with the cabinet. With this arrangement the l01G Power Plant will be located above the equipment cabinet with approximately 2" separating the two units. Should it be desirable to mount the 101G Power Plant on a separate floor stand a metal stand ED-95023-70 Group 3 is used.

Three other apparatus cabinets which are available can be used for mounting key telephone units of the angle bracket

Fig. 8-2-31A Key Telephone Units m-ounted front and rear on P-37B204 Angle Bracket mounting.

or mounting plate type .. These cabinets which have a capacity of 4, 1 %/' x 19" Mounting Plates or 11 or 18 mounting plates 1%" x 23" are available per ED-91472-70, ED-91194-70 and ED-91180-70 respectively. When it is necessary to mount angle bracket type units in these cabinet bent bars per ED-60143-70 Group 1 for 19" mounting plates or Group 2 for 23" mounting plates are used. The hent bars, furnished in pairs, are designed to occupy the space of one or two 13,4" mounting plates and provide for mounting three single space or double space key telephone units on both front and hack, thereby giving a capacity of six key telephone units per set of bars.

The 4-plate cabinet uses bent mounting bars 19" long per ED-69143-70 Group 1 and the 11 and lB-plate cabinets use bent mounting bars 19" or 23" long as required. The 11 and 18 plate cab· ind>~ are arranged for 23" mounting plates but each may be equipped with auxiliary framework to p(~rmit the mounting of 19" mounting plates. By using special adapter angle, mounting angles l':r; A502 for 23" spans or P37 A823 for 19" spans, the 200 series Key Telephone Units and the bracket P:17B204 may be mounted in the eleven or 18 plate apparatus cabinets or on relay rack dc~igned for 19" or 23" mounting plates. Two mounting angles are required for each row of panel type units or brackets.

STATION SET CONNECTIONS i\ ten ltmninal connecting block, 44A, is used to terminate key telephone set cords having more

than four conductors. The 44A Connecting Block may be used individually or in a group arrange­ment of up to four blocks.

The No~. lOlA-4 (Ivory) or 101A-9 (Brown) covers are used with a single No. 44A Connecting Block and two or three No. 44A Connecting Blocks may be mounted under the No. 101C-4 (Ivory) or lOlC-9 (Brown) covers. The Nos. 168A-4 (Ivory) or 168A-9 (Brown) Backboards are arranged

21

for mounting one No. 44A Connecting Block and the Nos. l68B-4 (Ivory) or _l68B-9 (Brown) Back­boards are arranged for mounting two or three No. 44A Connecting Blocks. The Nos. l68C-4 (Ivory) or l68C-9 (Brown) Backboards are arranged for mounting four No. 44A Connecting Blocks. One lOlA Type and one lOlC Type Cover are used when four 44A Connecting Blocks are mounted on a l68C Type Backboard.

Three No. 44A Connecting Blocks and No. lOlC-4 Cover

FIGURE 9

One No. 44A Connecting Block and No. lOlA-4 Cover

The following table associated with Fig. 10 indicates the terminals on which the various pairs of inside wiring cable and key telephone set cord conductors are terminated on No. 44A Connecting Blocks. The first group of ten conductors is for the fir st connecting block (one nearest butt of cable) and the second, third and fourth groups are for the second, third and fourth connecting blocks respec­tively. The cord attaches to the last block on the side opposite the side where the cable enters.

FIGURE lO

Four No . 44A Connecting Block~. One Nos . lOlA and 101C Covers Required

22

-

• TypeD TypeC Inside Inside

Connecting Wiring Wiring Block Block Cable Cable Cord No. Terminals Pairs Pairs Conductors

l Blue / Blue Red 2 White White Green 4 Orange) Orange Yellow 5 White White Black

1 6 Green ) Green Blue 7 White White White

-"9'\ Brown) Brown *Brown-Red I 10/ White White *Brown-Green ,__..-3 Slate ) Slate *Brown-Yellow

8 White White *Brown-Black

l Blue Blue-White Brown-Blue 2 Red White Brown-White 4 Orange Blue-Orange Red-Green 5 Red White Red-Yellow

2 6 Green Blue-Green Red-Black 7 Red White Red-Blue 9 Brown Blue-Browjl Red-White

10 Red' White Green-Yell ow 3 Slate Blue-Slate Green-Black 8 Red White Green-Blue

-.

l Blue Orange-White Green-White 2 Black 'White Yellow-Black 4 Orang'e Orange-Green Yellow-Blue 5 Black White Yellow-White

3 6 Green Orange-Brown Black-Blue 7 Black White Black-White 9 Brown Orange-Slate Blue-White

lO Black White Slate 3 Slate Green-White Slate-Red 8 Black White Slate-Green

l Blue Green-Brown Slate-Yell ow 2 Yellow White Slate-Black 4 Orange Green-Slate Slate-Blue 5 Yellow White None

4 6 Green Brown-White Slate-White 7 Yellow White None 9 Brown Brown-Slate Slate-Brown

10 Yellow White None 3 Slate Slate-White Brown 8 Yellow White None

* Double red, double green, double yellow and double black in cords with rubber insulated conductors. These conductors have ribs to distinguish them from the others in the cord.

FIGURE lOA

23

POWER SUPPLY I-

The relays used in the 1A1 Key Telephone System which require a local battery supply are arranged to operate on 14 to 26 volts. Battery for lamp operation may be either 10 volts AC, 14 to 26 volts DC or 48 volts DC. The power supply may be obtained from agy of the following sources:

a- direct fe~d over cable pairs from a central office

b - direct feed from a PBX or building battery

c- a local 101G Power Plant per 1·86731A List 6 & NP or List 4 & NP providing the following power:

Supply

DC (talk)

DC ( Sig.)

AC-60 Cycle

* AC-60 Cycle

20 Cycle Ringing

LIST 6

Voltage Range Resistance Load Range

14·28 0 to 20 ohms

18·28 0 to 32 ohms

9-ll 0 to 7 ohms ( 36-51A Lamps)

16-20 0 to 13 ohms (36-A3 Lamps)

**LIST 4

Same as above plus

75-110 1 to 8 high impedance ringers or 1 to 2 high impedance ring­ers with condensers

Amp.

0.9

0.6

1.4

1.4

* * The List 4 power plant is used when a 20 cycle ringing supply is required for private lines or to ring local bell or buzzers.

* The 16-20 volt 60 cycle output of the rectifier also can be used for buzzer signaling.

When the sources of power listed above are not available the following alternate sources can be used:

24

d- a local storage battery plant per 1-59010 floated over cable pair or charged from a local rectifier.

e- a KS57l4 Transformer for operating buzzers on alternating current.

f- a 393B Transformer for illuminating key telephone set lamps or indicator lamps on alternat­ing current.

Fusing

The lOIG Power Plants J-86731A Lists 6 & NP or List 4 & NP are equipped with 2 ampere fuses which eliminate the need for separate fusing when only the 101G power supply is used in a lAl Key Telephone System. In eases where a 1A1 System obtains battery over cable pair from a central office or from a local building supply separate fusing will be required only where the main battery supply is not attended by a maintenance man for the replacement of fuses. When the central office or local building battery supply is unattended individual circuit fuses for a 1Al. System should be furnished by providing a 201B Key Telephone Unit when space is available in apparatus cabinet ED-95021-70 or by providing a 21A Key Telephone Unit for mounting in a 105A W Apparatus Box or on mount­ing plates in the 4, ll or 18 plate cabinets. The 21A Key Telephone Unit is an angle bracket type mounting with space for six fuses and three ground terminals. When used in a 105 Type Apparatus Box the fuse panel shouk be mounted in the top half of the box to facilitate replacement of fuses when required.

OPERATION

Line Circuits

The key telephone sets listed herein provide for picking up central office, PBX, private or inter­communicating lines. Incoming calls on central office PBX or private lines are audibly indicated by the station ringers or by buzzers signaling which line to pick up. The key telephone sets equipped with signal lamps also provide a visual signal indicating which line has an incoming call waiting to he answered by illuminating the key button of the associated line at all stations at which the line appears. The tables of key telephone sets on the previous pages indicate the number of lines and fea­ture combinations available.

An incoming call on a line is answered by pressing the key button associated with the audible or visual (or both) signals received and picking up the station handset. An outgoing call is originated by selecting a desired line, pressing the associated key button and picking up the station handset. The line is then ready to place an outgoing call.

Should a local power failure occur all types of lines except the Central Office or PBX Lines become inoperative. With central office or PBX lines, however, it is possible during a power failure to make an outgoing call since selection of a line and removal of the station handset permits the line to receive a call regardless of the availability of local power to the key telephone system. If, during a local power failure, the local ringing supply remains operative the common audible signals, if pro­vided, will operate during an incoming call but will follow the incoming ringing on the line rather than locking in as would be the case when power is available to the relays of the system. During a complete local power failure it is possible, on Central Office and PBX lines only, to receive incoming signals only if ringers are bridged across the lines to operate on incoming ringing current.

Holding

A holding key button is provided on some key telephone sets to enable the subscriber to hold an incoming call while conversing with another person on a separate line or to transfer an incoming call to another station on the same line.

When the subscriber desires to hold an incoming call for the purpose of obtaining information over another line, transferring an incoming call, etc., the hold key button is pressed. This causes a holding bridge to be placed across the line and keeps lighted the lamp associated with the line being held so that other stations will know the line is in use. When the subscriber (or the station to which

25

the- call has been transferred) desires to pick up the line again the key button associated with that line is pressed and the hold condition is automatically released permitting the subscriber (or the person to whom the call was transferred) to converse on the line. The holding feature is not available with the automatic tie line circuit, the station line circuit, or the intercommunicating line.

Wink

A visual hold signal called a wink can be provided in conjunction with the holding feature to enable a subscriber to distinguish between a line being held and a line in a normal busy condition or a line with an incoming call. This "wink" signal feature uses the same signal lamp used for line and busy signals, but has a long "on" period and a short "off" period giving the impression of a wink when the line is in a held condition.

Intercommunicating Lines

Both manual and dial intercommunicating lines are available with the lAl Key Telephone System.

Manual lntercomm

The manual intercomm line requires the use of a battery feed relay which provides talking battery to the stations connected to the line and which in addition, when the intercomm line is being used, lights the associated line lamps steady indicating a busy condition on the line. With the manual intercomm line a separate audible signaling system is used to indicate to stations on the line that a call should be answered. One or more intercomm lines per station may be pro­vided, each requiring the assignment of one of the pickup buttons of the station key telephone sets. Each line requires a talking battery supply which is obtained from the lOlG Power Plant or from any local talking battery supply available in the office in which the lines appear.

Dial lntercomm

The dial intercommunicating line permits any one of a maximum of nine stations on a line to dial any other station on the line by picking up the telephone set handset pressing the line key button associated with the intercomm line and dialing the single digit assigned to any other sta­tion. The line lamps at all stations on the line are lighted steady as soon as a station picks up and selects the intercomm line. At the completion of dialing the buzzer or bell assigned to the called station only will ring for a period of from one to three seconds indicating to the called station that a call is to be answered. If the called station fails to answer a dial intercomm call the calling station can hang up and repeat the calling operation to cause the audible signal to operate again for one to three seconds at the called station.

When desired, a flashing feature can be furnished with the intercomm line to provide a flashing line lamp at only the called station while the uncalled station line lamps remain lighted steady. A stations cut off feature is also available with the dial intercomm line which permits cutting off all stations except calling or called.

Common Audible Signal

When it is desirable to have two or more C.O. or P.B.X. lines operate a common audible signal it is possible to connect one or more ringers or buzzers mounted external to the telephone sets so that an incoming signal on any line will cause a steady audible signal to operate. By using an audible signal con­trol circuit which is part of the 2llA Key Telephone Unit or the separately mounted l6A Key Tele­phone Unit, a second common audible signal can be provided. The ringing signal when this equipment

26

is used will provide, when associated with the Automatic Tie Line Circuit or the station line circuit, a steady signal and when associated with the C.O. or P.B.X. line or the ringdown tie line circuit, an inter­mittent sif!;nal which follows the incoming signal. A ringing supply, either 10.5 volt 20 cycles for ring­ers, or 18 volts AC or 20 volts DC for buzzers must be provided for the common audible signals.

When desirable, a 7-type buzzer may be mounted in any of the key telephone sets in place of the ringer by using a No. 44B Bracket. The buzzer may be used as an intercomhmnicating signal buzzer or as a common line signal. The No. 44A Bracket is also arranged to mount the l.52A Condenser which ~hould be used when radio frequency suppression is required for the buzzer.

5 HYPOTHETICAL INSTALLATIONS Equipment and apparatus sumaries for various hypothetical installations of the lAl Key System

are shown as a guide for determining the requirements of similar installations. No wire or cable is in­eluded in these summaries. Cabinets are assumed to he wall mounted.

l. Three dial operated Central Office or PBX Lines appearing at five stations, no optional features used.

Quantity

5

15

15

5

5

Description

544BBW-3 Telephone Sets

51A Lamps

200DW Key Telephone Unit

44A Connecting Blocks

168B Backboard

l01C9 Covers (Brown) or 101C4 (Ivory)

J-86731A List 4 & NP l01G Power Plant

SD-69219-01 Drawing

Function

Hold and 3 pick-up keys.

Lamps for line keys 3 per station (no spares included).

Line and hold relay equipment for 3 lines plus common lamp flashing and incoming signal time out circuit mount­.. d and wired on a 16A apparatus mounting with a 117 A w COV('f.

Termination for Key Telephone Set Cords (3 per station).

For mounting 3 Connecting Blocks.

CovPrs for connecting blocks.

DC-18-28 Volt supply for relay operation. AC-60 cycle 9-ll Volt supply for lamps in telephone sets. AC-20 cycle 75-110 Volt supply for ringers in telephone sets.

Telephone Set Circuit.

2. Four dial operated Central Office or PBX Lines appearing at .5 stations with wink signal fea­ture for hold lamps, one manual intercommunicating line appearing at all stations. Code ringing on in­tercomm signaling circuit.

Quantity

5

25

20

5

Description

564 BBW-3 Telephone Sets

51A Lamps

200EW Key Telephone Unit

14A Connecting Blocks

101A9 Covers (Brown) or l01A4 (Ivory)

Function

Hold and 5 pick-up keys.

Lamps for line keys 5 per station (No spares included).

Line and hold relay equipment for 4 lines plus common lamp flashing and incoming signal time out circuit mount­"d and wired on a 16A apparatus mounting with a ll7AW cover.

Termination for Key Tel. Set Cords. ( 4 Per Station)

Cover for 1 Connecting Block.

27

5

5

1

1

5

5

101C9 Covers (Brown) or 101C4 (Ivory)

168C Backboards

J-86731A List 4 & NP 101G Power Plant

210A Key Telephone Unit

31A Kt>y Telephone Unit

P37B204 Bracket

7AW Buzzers

551A KPys

SD-69219-01 Drawing

Cover for 3 Connecting Blocks.

For mounting 4 Connecting Blocks.

OC-18-28 Volt Supply for Relay operation. AC-60 Cycle 9-11 Volt Supply for lamps in Telephone Sets. DC-14-28 Volt supply for talking battery for intercomm. AC-60 Cycle 16-20 Volt Supply for buzzer operation. A.C-20 Cycle 75-110 Volt Supply for ringers in Telephone

Sets.

Wink signal relay unit for association with hold feature.

Lamp lighting relay for lamp busy indication and talking battf.ry fet>d for intercomm.

Bracket for mounting 31A Key Telephone Unit in ED95021· 70 Cabinet.

!ntercomm signal at each station.

Intercomm signaling keys one per station.

Telephone Set Circuit.

3. Four dial operated Central Office or PBX Lines appearing at seven stations with wink signal feature for hold lamps and one dial intercommunicating line having access to all stations. Dial inter­comm to have Hashing line lamp at called stations only, other intercomm stations steady busy lamp.

Quantity

7

35

1

28

7

7

7

1

1

3

7

28

Description

564 BBW-3 Telephone Sets

51A Lamps

200EW Key Telephone Unit

44A Connecting Blocks

168C Backboards

101A9 Covers (Brown) or 101A4 (Ivory)

101C9 Covers !Brown) or 101C4 (Ivory)

J-86731A List 4 & NP 101G Power Plant

210A Key Telephone Unit

207 A Key Telephone Unit

208A Key Telephone Units

7AW Buzzers

SD-69219-01 Drawing

Function

Hold and 5 pick-up keys.

Lamps for line keys 5 per station (no spares included).

Line and hold relay equipment for 4 lines plus common lamp flashing and incoming signal time out circuit mount· ed and wired on a 16A apparatus mounting with a 117 A W cover.

Terminations for Key Telephone SPt Cords.

For mounting 4 Connecting Blocks.

. Cover for 1 Connecting Block.

Cover for 3 Connecting Blocks.

DC-18-28 Volt Supply for Relay operation. AC-60 Cycle 9-11 Volt Supply for lamps in Telephone Sets: DC-14-28 Volt Supply for talking battery for intercomm. AC-60 Cycle 16-20 Volt Supply for buzzer operation. AC-20 Cycle 75-110 Volt Supply for ringers in Telephone

Sets.

Wink signal relay unit for association with hold feature.

Dial intercomm relay unit.

Station lamp flashing circuit for intercomm. One 3 circuit unit required for each 3 stations on line.

Intercomm signaling buzzer at each station.

Telephone Set Circuit.

4. 3 Dial op~rated Central Office or PBX .Lines appearing at nine stations with wink signal fea­lure for hold lamp:- and one dial intercommunicating lim: having access to all ,;lations. First station to have exclusion key and cut-off button to permit fir~t ~tation to cut off <<ll others on two of the three lines. Dial intercomm to have automatic cut off of stations and fla,;hing line lamp at called station only,

other intercomm station!' having steady busy lamps.

Quantitv

8 l

9

:16

')

')

:~

9

Description

564 CBW-.3 Telephone Sets

565 EBW-3 TP!ephone Set

5lA Lamps

200DW Key Telephone Unit

l68C Backboard,;

iH\ Connecting Blorks

101A9 Covt·rs iBrown) or

101/14 (Ivory)

101C9 CoYer:-> (Brown) or

101C4 (Ivory I

J-H67:il \ List 'I & NP l01G Pow.-r Plant

2lOA Key Td~ephont· Cnit

207,\ Kq T<'l<·phonc L:nit

20HA K•·y TP!t·phorw linit

7.·\ W Bnzzt•rs

2bB K,.,, Tcl..phone linit

P:Hil204 Hrackct

SD-69219-01 Drawing

Function

Hold K(;y, 5 pick-up keys, with exclusion feature.

Hold K<·y. 4 pick-up keys, cut-off h·y with exclusion feature.

4 JWr stat ion (no spares included).

LitH' and hold rday equipment for 3 lint'S plus common

lamp llashin12: & incoming signal time out circuit mounted

and wired on a Hi A apparatus mounting with a 117 A \V \-0\Tf.

For mounting 4 ConnectiHg; Blocks.

T.-rminations for Key Tr·lcphune Set Cords.

Covers for l Cnnn\'cting Block.

Covns for 3 Comwcting fllocks.

DC-1H-2H Volt Supply fnr Relay opnation.

AC-60 Cycle 9-ll Volt Supply for lamps in Telephone Sets.

DC-14-2H Volt Supply for talkin!-': battPry for intercomm.

AC-60 C::-de 16-20 Volt Supply for buzzPr operations.

>\C-20 Cyde 7S-1l0 Volt Supply for ringtn in Telephone

St·ts.

Wink signal relay nnit for association with hold ft>ature.

Dial intcrcornm relay unit.

Station lamp lla,hing circuit for int('rcomm. O!le 3 circuit

unit n·quir .. d for •·ach .'l stat ions on line.

lnt('lTOIIIfll signaling buzzer nt each &tation.

Station cut-off relay unit for intncomm line.

Brack.-t for mounting 26B KTli.

a. 3 Dial operated Central Office or PBX Lines appearing at six stations. 1 Automatic Tie Line from :-;lation ] to ~eparate key telephone system* 1 :-;tation line f~nm Station 1 to individual station tell'phone set.

QuantitY

,)

]()

Description

S:~1BBW-:1 TelcphonP SPis

.)fi4BHW-:J T,·leplwne St'!,

:ilA Lamps

200DW Key TC'lt-phmw lJnit

Function

Hold and :l pick-11p keys for stations 2 through 6.

llnld and S pick-up k.-vs for station 1.

Lamps for line keys (no spare,; included).

Lint' & hold n·lay equipnu·nt for 3 lirws plus common lamp

flashing and incoming signal time out circuit mounted

and wired on a 16.'\ apparatus mnunlin12: with a li7A'W COVt'f.

29

15

5

1

6

2

1

1

1

1

44A Connecting Blocks

168A Backboard

168B Backboards

B168C Backboard

10lC9 Covers (Brown) or 101C4 (Ivory)

101A9 Covers (Brown) or 101A4 (Ivory)

203A Key Telephone Unit

205A Key Telephone Unit

J -86731A List 4 & NP l01G Power Plant

SOOCW-3 Telephone Set

SD-69219-01 Drawing

Tt·rminations for Key Telephon<' Set Cords ( 4 Blocks at Station l, 2 Blocks at Stations 2 to 6, 1 Block at individ­ual station).

For mounting connecting block at individual station.

For mounting connecting blocks at Stations 2 to 6.

For mounting connecting blocks at Station l.

Covers for connecting blocks Station 1 to 6.

Cover for 1 connecting block at individual station and Sta· tion l.

Relay equipment for Automatic tie line circuit (no hold ft•ature available with this circuit).

Rt'lay equipment for station line circuit (no hold feature available with this circuit).

DC-18-28 Volt Supply for relay operation. AC-60 Cycle 9-11 Volt Supply for lamps in Telephone Sets. DC-14-28 Volt Supply for talking hattery for tie line &

station line. AC-60 Cycle 16-20 volt supply not used. AC-20 Cycle 75-110 Volt for ringing supply on tie line and

station line for ringf'rs in Telephone Sets.

Station Set for individual station line.

Tt'lephone Set Circuit.

*Automatic tie line relay equipment is required at both ends of tie line. Unit for distant end is not included herein.

For further information regarding the No. lAl Key Telephone,System, you are invited to address the Western Electric distributor whose name is listed on back cover.

30

INTERCONNECTIONS BETWEEN UNITS

To show simplified interconnections between key telephone units various typical connecting ar­rangements are shown on the following pages. The figures listed below in the reference table illustrate individual features of various circuits and for purposes of clarity show only those circuit contacts and terminal punchings associated with the feature illustrated. Strapping between punchings represents wiring which is sometimes provided by the factory and sometimes added at the time of installation .. Part of the same relay apparatus or circuit may be shown in more than one figure.

CIRCUIT USED WITH FIG.

212A KTU II Automatic Tie Line Circuit 203A KTU

209A KTU 12 Automatic Cutoff of Dial Selective Inter-

207 A and 208A KTU 13 communicating Line Circuit 26B KTU

Central Office or PBX Line Circuit 16A, 211A, 212A KTU 14 202B KTU with Common Audible

16A, 209A, 211A KTU Signal 15

Central Office or PBX Line Hold C;rcuit Key Telephone Set 16 202B KTU

Central Oflice or PBX Line Circuit 212A KTU 17 or 202B KTU 209A KTU 18

Cut-through and Control Circuit for 19-21 Automatic Cutofi 26B and 29A KTU

I Station cannot cut off other stations and can be cut off except during a 19 call (K wiring)

2. Station can cut off other stations and can be cut off except during a 20 call (H and K wiring)

3. Station can cut off other stations and cannot be cut off (H and J 21 wiring)

Code and Selective Signaling 3A KTU 22 Dial Selective Intercommunicating Line

23 Circuit 207 A KTU

Dial Selective Intercommunicating Line 208A and 212A KTU 24 Circuit 207 A KTU with Flashing Line

208A and 209A KTU Lamps 25 Intercommunicating Line Battery Feed

23A, 209A, 2l!A. 212A KTU 26 Circuit 31A KTU

Lamp Winking Circuit 210A KTU 202B KTU and 212A KTU 27 202B KTU and 209A KTU 28

Lamp Resistance Circuit and AC Supply 29 for Lamps (9 to II Volts)

Lamp Resistance Circuit When Flashing Lamp Feature is Provided - IOIG 30 Power Supply Connections

Power Failure Circuit 212A KTU 202B KTU 31 Power Failure Circuit 209A KTU 202B KTU 32 Ringer, Buzzer, and Noise Suppression

33 Circuit for Battery Supply A

Ringdown Tie Line Circuit 204A KTU 212A KTU 34 209A KTU 35

Ringing Lamp Circuit and AC Supply 36 for Buzzers (15 to 25 Volts)

Station Line Circuit 205A KTU 212A KTU 37 209A KTU 38

212A Key Telephone Unit 39

31

2

I I I I I I I I

TO TIE LINE CKT

AT DISTANT KEY TEL

SYSTEM OR KEY EQPT

RINGER[(­OR 36!---------,

BUZZER SUPPLY

3 I

r Rl ;!TOP

TO·~ SET I l,~

@ f3' BAT - I-

Ll 4

I @"B" GRD 25 26

I ____ -------

3

4

0= TERMINALS ON KTU TERMINAL STRIP

FIGl~RE ll

2()-_fll_i -: 8

co 2

1 -=- B

Automatic Tie Line Circuit- 203A and 212A Key Telephone Units

~-----------T---

1

I I I I I I I I I I I I I I I I I I I I I

TO TIE LINE CKT

AT DISTANT KEY TEL

SYSTEM OR KEY EQPT

I @"8'GRD L ____ _ ,--- B LINE

6 L8 NO --~--~

_. -1 5T LF@

----~~ 3t LF@- 2

---~ It IF -3 L____~~~@ ,. ,,

8 TS A

L 6 TB r-----------------------<1-~-- -

~~

Ll

A J 3 .-~--C>---4-----+--. 8 ! 2

2

5BF

8TR

'+3'\1~ _j_l JB

3 2 (Q --- I

·~elf 4T

~l--l~lqj

T '--~9

I~ -~--------- -0 3

I I I I I

LAMP BAT I co 31 1

6

@)A'8ATj

@)'A'GRDI _____ _j

------------, 209A KTU 1

Q· I T 0 \'_::?/8 BAT I ffi1- C@Y'B'GRD

L_ __ ____:5::._T:_:_F_____. " ,, I TS B I

3T A

IB

, •3BF l ~

I J I' I j_ I

I I I I I I I I I

I I I I

______ _j 0- TERMINALS ON KTU TERMINAL STRIP

FIGl'RE 12 Antornatic Tie Line Cirruit ~--- 203A and 209A Key Telephone Units

3

~-----------------WS~Tu--l

I ~ c "~c ®= FOR TERMINAL I I

'

®A - ~ A -:- ASSIGNMENT TO * TO (*\)-'-'-------, SEE TABLE BELOW I

I TEL. ~~R TEL. 'S::: R STATION T STATION r*\~----.

~T I I _)..;....-- -~J-0---

1 L L I I 3~~ ~2n ~~ I I• 5 c-::4:- I 5 c-:::h

I 4 + LS 4+ LS I - r- 6T .§I.;= r- 6T l6_T -

I 5 ,cl-._.)_75=-o'-n---t'""' ~" D 75on 5Bcr-D 75on. < 75on 1

± 5% ~1-D ±5% r=- ± 5% ~- ±5%

I 2 ~ ~J'tl- _.42~ ~31 ~~ 2 .__ ~~~~ 2 "-- i71'b_ I I -~ "" 4 IT -= I 3l 4 r-+-+-~~3~'~"~4----~

le w ~ ~ll: ===)l-T---JO [ cr ~ w 8 .________,0 u ~ I I ..--+--- ST~t:bENRs --+--+--+____. BAT 1s FURN. THRu' ~"c" BAT. I I 21 * 12 13 13 12 * 21 THE 2ND 204E ~38

R SELECTOR TO THE I "C" LEAD OF ONLY "C" GRD

T THE STATION DIALED 40 . I L- f------ -- r--- -,-- -- -- --------- --

~- f-- ~~--:-A-2;-r._-_-__,r-- -r--- ------- -- --l J I u. ,.._ cr I CKT.NO. 2GB KEY TEL UNIT I

I CD U) ~ co I I t Ia. v I 12 ...L--("':>-'-"'------{-0 J I i "A"GRo-l@l ~~ ::; ~ I '"...I...---o-:-9---.--r-;W~ I I

"A" BAT.~,., ""_en I 8 : 0 IIQ_c I

I A -:,; T A I 6 • ....__--o-3"'----r--. I I l_?07 A EU_j I E 12

4-1---oo-1-.... I

I co 2~~~~-.

'--------------t-----t-~C..:::.O-+<~ 13T- I I

208 TERMINAL ASSIGNMENT 300.0< 13B @ STATION I

I LEADS -

I STATION "E"LEAD T R A ... 9 E 6 "'

5 I 2 2 2 I 2 3 I+-..;:;....--'=--HI 6 3 I

I ~6~ 3 2 3 6 7 a 1.,_...::.a_-=E=-+-< 15 4..----o-"',-t----.

4 24 9 10 II E 7 E 2 4--'-~f-{ 14 7 I

I 5 22 · I 2 3

2ND 6 23 6 7 8 17 8 ,..,9 I I 208

7 24 9 10 II 18 10

L -~-~~ -~- -~-t -~-~~-~- - - -- - _CD-----rr+_l II _o'_2 ___ 0 __ -- J 0 =TERMINALS ON ~TU TERMINAL STRIP

FIGURE 13 Automatic Cut-off of Dial Selective Intercommunicating Line Circuit-

26B, 207 A, and 208A Key Telephone Units

,-------------------------l I 202 B K T u A

4 Trf\ I I ®T 3+ \..:_) I I 31

I TO 2 ~ I I

CENTRAL TO KEY I 7T "A"LEAD

OFFICE 3 8 I I OR 500Jl

't---I-"'7...:::.B_, I' h TEL c KT. l

I PBX LINE _B LK I

CKT 38

I 32 R 3 R 2 :

I "B"sAr-@ 4 r -=--~--=~~-----~-~

II 2 11) 20 TO TS. "A" I 1 rs"s" 112n 1 I "B"GRD.---@) II ll.I.fl___f"W..B ®- "B" GRD I

I R j 18 2 8

11fu_ I

I 2UF I\ I 317 A 11 I ® t K T u TS"A" @- "B"BAT. I

l VARr~ S~: R 4 ~12A ~6Nrf~~O~~S~~~l~=r~-~ I 8A

3 J I I

rHERMISTOR 2 l TO AUDIBLE SIGNAL

20 POWER SUPPLY

I p;~7o/~n I I 6BR - I I 40~ E I I VARISTOR 2 NOTE I

I ffl"" O·TERMPCHGS.ON 202BKTU· :

~----- ------------------~ ri6Aou--

4 ----------GERMINA~MBE~WH~~~

I IS USED INSTEAD OF 16A KT u I I I I I I

I­I/)

'' B"GRD. -(j) 18

Rl L I I @--- "B"GRD I

I R--@ I :RR--<2) I

TOP L:~ ----<D---- I TO 2ND COMMON AUDIBLE I

Rl

"0'----------'2 R 9 INTERRUPTED SIG I I IT LEAD UNDER TERMINAL' RR 7 TO AUDIBLE SIG. I L

FOR TESTING PURPOSES POWER SUPPLY ON 16 KTU ONLY _j

0 = TERMINAL~O;-K ~ -:;:;RMINAL STRIP--- -----------

FIGURE 14 Central Office or PBX Line Circuit- Comrrwn Audible Signal-

16A, 202B, 211A, and 212A Key Telephone Units

35

36

,---------------------------,

2.UF I 317 A I VARISTOR s ® I ~)---!

: 1 I I I I I I I

- R SA

THERMISTOR

R

i ·~36 ~---­

li6AKTu--l 4

I I I I I I I

" B"GRD. --<D I B

--------------------T~Q)

"A" LEAD ~~-----~~~~---~ 3

I I I I

TO KEY I a I

TEL. CKT I I

----;-o----+-------...;R~ 2 I I----- ----------1 I I I I 9 TO rs "s" I

112Jl lrs"A" llliLfl.!!.-B (§--- "s"GRD. 1

: 2sl,~ I I s-=- I I Ts"s"@- "B"BAT. I ~0 9 A ~ TJ:l __ _:_ _______ j

R 8

ro 1ST COMMON AUDIBLE] ---~4--R--4-~ 7 CONTINUOUS SIGNAL

~--------~19~----------

2 TO AUDIBLE SIGNAL 3 J l r POWER SUPPLY

P·475f1 ~ I· i 5% _j_

Rl

NOTE

O=TERM. PCHGS. ON 2028 K T u.

----------- _J

Rl

GERMINAL NUMBERSWHEN 211-;- i I IS USED INSTEAD OF IGA K T U

L I I ®- "B"GRD. I

I R---@ I IRR----<Z) : lsT--(D j L_ _______ _

2M TO 2ND COMMON AUDIBLE I ~---------J2 R 9 INTERRUPTED SIG

IT LEAD UNDER TERMINAL\ RR 7

TO AUDIBLE SIG. I FOR TESTING PUR POSES\-,__;_.....( POWER SUPPLY I

L_- -------- ~N~TU ONLY------------- _j 0 = TERMINALS ON K TU TERMINAL STRIP

FIGURE 15 r:entral Office or PBX Line Circuit- Common Audible Signal-

16A, 202B, 209A, and 211A Key Telephone Units

~-------------------------~

I TELEPHONE SET I I I I I I I 1 I

I :

0 0 0 \ { 0 0 0' Ll

~ DIAL SWITCH

I I ::::.~ CONTACTS HOOK

0 I I

I : r • •

~

I o I L2

r----- T

I HER I K-UP

OT ,.---PIC

I EYS I ....-- K

/A

I I r-. ...

I I T ~

l-202 I I ND I

--------------, ; \j B KTU I

1 g~ [ PBX I LiNE l

I I I I

316

T 31

R 32

A/ I I I

VARIS TOR

I I

I I I

A 4

3f.- 7B I b_ sooc_~ I _n_ c D -=-

7T

31- 4

5 ... 6 " ~ 1~1 ~~

/

H 4

3 .. 2

~~r 6TR lc P 5·93 .n. 48R

5TF ...... D 3BF ( f.-D P-93 .n.

'--

I I

T I

AI I 6

~ A I

3

R ! 2

I liB"

@ I BAT

I ~ 'e• @ GRD I 5 G I

TO I L

SIGNAL LAMP I 4

] TO I 9 39 LAMP I

~ POWER

10 SUPPLY I - I

I

1 0 · = TERMINAL PUNCHING$ ON 202B KTU

I

R

2 PIC K-UP I

EY K .. I •

"' f

• ~I

I I I I I

ST I ~~UP I

+ +

~

T

PIC K

I I

HOLD 1

1 KEY

I I I I

L ________ --------------- _ _j ---------- __ j O=TERMINALS ON KTU TERMINAL STRIP

FIGURE 16 Central Office or PBX Line Hold Circuit- 202B Key Telephone Units

37

33

Central Office or PBX Line Circuit- Lamp Flashing, Incoming Visual Signal, Time-out, and Busy Signal Circuit- 202B and 212A Key Telephone Units

'o= TERM~CHGS ON 2028 KTU-- -A------ --------l 6 I I co 28

I I 5f.

B-l 4 T I T "

@ T 3t

I TO I I ~y I

TO CENTRAL 2* I LK J3aL-

OFFICE K OR r- 7T A A

BX.LINE 3 T

I P. EL

KT I 500.n~r- 7B lth_ JIB 6 AI c

R ,,, 32

I I I "B 1

3t '- 4 B = R

"BAT~ -® I R +2 /

I TO

"B' TA. I : ~:p I

'GRD.+--@ L

~ L s

5"+ 6 L8 LG s

R L

9

I LA AMP I 8 AT

PPLY

I ~A I

2UF :::-h® 2 R ,.. L

:;r@ R -~D ~ P-475It ~~I 0 8

. SA 317A -r r- 25 J-su THERMISTOR VARISTOR- 5% D 5TF MP@ R I ~ 6BR 15

I I I I

J_8 RD. 400 E r- S-3050.0. - 5 VARISTOR 6TR

2 '--

-- 8~ 2 TO 27

I I L 3t 4 LF 17

L~ _J 02 B KTU ------------------------- ~ r- 1----------------------------------12 09A KTU

I I "8' 'BAT~

TS."B"

GRD.+---@ 1"8" I I I I I

8 6

LINE NO

-~

I

5t LF @-4 LB ~ r LF ::; -

~ It LF@-

'~ I -=-

7

B 78 (

'() (/)

I-

8 T. S. "A"

9T T.S. "A"

I

2

3

TO r" ~~ •2 --=- B a::

6TR .':!2 S-340Il

5TF ( 4BR Jlh_ P-255.0 C 38Fr B

-

~ILB r====l2 ltb_ IJ I -

8_ LK 9 TO

15 14

co 3T ~ A 6

2 =:j lsR I I I II

I 235.0 18 12

"--1-- r---

4

- -l I I I I I I I I I I I

IB_ II IT

D235Jl TOP

l L--~ 3 - 2?---- LF - 4 -

27 BI TS"A"

I I I I

-=- LB

4<(--- •3 30 -- 5

LF 29 LB LB

L I -----------------------~

20 ~

6 ?- _ __!_5 LF - 6 LF 19 ...

O=TERMINALS ON KTU TERMINAL STRIP

FJGlfRE 13 Central Office or PBX Line Circuit- Lamp Flashing, Incoming Visual Signal,

Time-out, and Busy Signal Circuit- 202B and 209 A Key Telephone Units

39

40

r---------2~~------------l

I CT I I 6 '

~-------------k~~----~----1 i '-.:../ 5 4 ki---------T

@---<~ 4-3 ~ ..._ i /A, 400A

.----------+lif3\ 2 -=- ~¥ _/VVARISTOR '\..":/' a:: I 6 '"' ~ R

~--~7~8~~~ 2'~~ 550''c __ 7T @~ A

7 TO KEY a TEL CKT.

(PICK-UP KEY)

i 2 '---t--f---"!-

~----------l AI

0 +s

·fi3\

(K) 10 c ® I® 'fi4)

l_ i\:../

To icp ~----60-----~~5 5~,-----;~ TO OTHER 29A

KEY UNITS r.---:

;: oc .._ n:: ~ 0:: i= ~ t= 0:: <( <( 1~1 L~t=t==J--+- TO OTHER 29A 'KEY UNITS ~ ~

r ~~a::+-m~ _______ A_s_s_o_c_._W_IT_H __ S_A_M_E_L_I_N_E ________ ,_~~-r-r~~-+-~+-0::~~ 268 KTU

co I

oJ+I~~t-----ll----.l~2 ~

: TO l'---¥--~-+--1----..~~ : -~H---' I

L I NE R ./ Jo-e.~---<::>--- /"""'-...---~JIO~H-------~ CKT. )_ j 6

1203A 204A

I 205 A 2.12 A

I 20&2 B I K.T.UNITS

I I I I I I I I

STATION OR STATIONS CANNOT CUT OFF

OTHER STATIONS AND CAN BE CUT OFF

EXCEPT DURING A CALL

( K WIRING)

3 ...---~ lll-+-----...1 _i-4

3

5 ~H---------------~ ~

16l-+------------------...1

f8 9 17l-+--------------------...1

18).+-------------------'

{-;\ 12 fll-0 \!_;f------<0).-------'--

B

I I I I

L ________________________ _ __ I O=TERMINALS ON KTU TERMINAL STRIP

FIGURE 19 Cut-Through and Contr.ol Circuit for Automatic Cut-off ( K Wiring) --

268 and 29A Key Telephone Units

I--------- 29A KTU ----------1

I ~---CT----~ I I I

~--------~~~~--6~-- I 1'-J 4 ~""- T I

I I

I I

I I I I I I

r--~1®~-o-----.-3 ~ I /A,400A I .------t-~:0 2 .-- ~~D_./VYARISTOR

I~ a:: I 6 .L ... ~ R I li::\ 7 B 5!2. D ..... ' ,.--f\0 550n 7 T @ To KEY a TEL CKT. 1

9 (PICK-UP KEY) I~ I ' ... A

~-+~~~~ --~2 '''---~~-~ :

® ~~ @ Ls AI 8 ;:-:t:t~ ® IYij'\ l . IJJ oo Q 1

1 I~ ..~ ::.:: .........

~4 3 ~a.::::>::)~ ::) uu (/)

~ dl:::: IJJ... I I~ 0 2. I § ~~ ~ 2 CD~ ffi I ~- <' ::.:: ~ :i :i ~

TO OTHER 29A o uuo KEY UNITS 1- I ® I

,, l_t=t==t===1-.To OTHER29A KEY TEL UNITS • -) AS SOC WITH SAME LINE

I 1- <l a:: (IJ 26 B KTU

II ll2

9 .J1o 8

7 .J8 9

5 .. 6 10

II 3 -i4

fj2l ), .2

I co ]11Jr-f0}-------, I TO '-----+14 l-----o------I-

1 ~IKN{ [.4 -:~ I 203A ...;T_-+-__ __,.-~

204A

I 205A R ~~6;~---lo.....O---I 212A ......-1 ~

I 2~2s (TUN ITS

r-

138 3001l

I (

'--

13T -®-1--

42 14 3 STATION OR STATIONS

CAN CUT-OFF OTHER STATIONS AND CAN BE CUT OFF EXCEPT DURING A CALL

5 ----.-4

L.,.;.--( 15-:H--------....1

( K AND H WIRING) -f 6 '

7 ..___-i IGl-1-----------' ~--

;::: ir a:: a:: 0 0 1- a::

9 ~8--il?l-1--------------~

-. 10 18!+------------'

Q)~---~~----~~

<l i B

I I I I I I I I I I I I I I I I

I I I

- --- --- - - ---' I I -- --·-- -·- ------ -·-· --- --- - ----- ---··- --------Qo TERMINALS ON KTU TERMINAL STRIP

F!Ct'RE 20 Cut-Through and Control Circuit for Automatic Cut-off ( H and K Wiring)-

26B and 29A Key Telephone Units

42

r--------------------1

I I I I I I I

29A KTU --,

CT ~--------+< I J----<6,___---,-

~ T_, ~....... A

10;---o----~ • ./ 400A

r-----+---H 2 _ ~*O .// VARISTOR

4

I I I I I \V !r ~.1">.~ R

...--4---+{'7' 7 B ~ - ~ . 2 , .. T I \!J 55 0.1\.( 7T ..f9\-__j

TO KEY a TEL. CKt I ® I ~ i2 '3'-.._'----+--+----'A'-"-

(PICK-UP KEY) I I I I I I I

0 , [

r@ 1::\S AI J.7\ \V .fs / ~ I ~3

I® 6 ~~---+---

I o I !-.t=:f===}----. TO OTHER 29A KEY TEL UNITS ~

1- <t cc ASSOC. WITH SAME LINE

I 268 KTU

Ct9

I co I TO ~~----6>--1 _ _...112

..;...;... .~ 9 +to '-V

I 203A ~TR--~-----'~~ ~H-~--~ 204A 7 te ~

I ~?it ~---------~~ ~H-~----~

TO OTHER 29A KEY UNITS

I ~~Nf [/.Lor-+ A---lf----..J .-~....;f8'>+-t---~

a 5 t6 ~

1 2o2s Jli'H-~------~

I K.T UNITS 3 t 4 '-.:./

~--~~~~--------~ I I ,..- + 2 '-:.::/ q

I rl_ llr- -@)--.+--t---=-='3=8 -+--+-.3~~; I ._4-<~~~~~~:~~{§t~ I 3 + .... 2=-----<®H------------....

I STATION OR STATIONS ~ t_4 CAN CUT OFF OTHER 5 ........... -o----.-

1 STATIONS AND t 6 J.A'-

16 _ _,

15H-----------'

I- a: <t cc cc 0 0 I- cc

CANNOT 8 E CUT OFF J.. _H-----------------1 { H AND J WIR lNG)

9 + 8 @)-1-------------------'

I .10 ~H-------------------~

i B

I I I I I I

';;;;?

I 0 ~ ~ I L ---- --· ---------------- _j 0 = TERMINALS ON KTU TERMINAL STRIP

FIGURE 21 Cut-Through and Control Circuit for Automatic Cut-off (Hand] Wiring)-

26B and 29A Key Telephone Units

,--------"---------------------------- "--, I I I I I I STATION I STATION 2 STATION 3 I I I I - ~

I I (s'(s' R(s)[Z ~) c z c ( c s s J

!'---" !'---" ~ ,-- ~'------" t'--"' '---" r-- ,..____.., ~ I'-' I I I BAT I I I I GRO I I I I I I I I I I I I I I I I I I I s

I I I I I I I I I I I

SYMBOLS

6 -~ 4

~ 2 ,...--<

~ 7B ·cf-~ ( 7T

6 I+'- 2

5 3. 4

4 5. 6

'3A KTU

PUSH BUTTON FOR CODE SIGNALING

PUSH BUTTON FOR SELECTIVE SIGNALING

BUZZER

<!}--~

0

-®--~~~~ 2

I I I I I I I I I I I I I I I I I I I I I I I I

L -- ,, __ ,_ ,- __ ,_-- - - ----- --- - --- --- ----- -------- _ _j

0 =TERMINALS ON KTU TERMINAL STRIP

FIGURE 22 Code and Selective Signaling- 3A Key Telephone Unit

43

44

~----------~------------~ I I 207A KTU

I AUD. SIG. AT INTERCOM STA. (CODE 9) : :

I I I 1--- _I I I I I (;>"A''GRD I

~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ . I 0~"A"BAT • I I I I ~ I

I 10 ~: I s I I TO AUDIBLE I ON -=- SIGNAL

I POWER I A 25 SUPPLY

204E I SELECTOR

I I I I I

RM

S-70011. _d 1[~------------l

-= 8

I z .J__--a-.:-___,

I I I I I I I

T 38

5T

2

A

c

58

I 18J 30Jl

2 r----'J.:------' 1.....----=..:r

I 2

A I T KS-13918 ll IOOOUF

I - s II I ______ _

O=TERMINALS ON KTU TERMINAL STRIP

s-=-

FIGllRE 2:1

~ I­V

: ~ ] TO INTERCOM STATIONS

LG

SIGNAL LAMPS AT INTERCOM

STATIONS

8

GRD TO BATTERY SUPPLY FOR

BAT LAMPS

Dial Selective Intercommunicating Line Circuit--- 2(17 A Ke_y Telephone Unit

208A KTU ~208 TERMINAL ASSIGNMENT ,----, r----11 STA. Lf~DSs;AT~O~L~AD~ C~~ ATION;

I ~ 1ST 2 18 I 2 3 33 30 ..--------<* I (3) I I r. ~ I \..;! V ~ C 208 3 I 9 6 7 8 34 31 I I TIP * - 4 20 9 10 11 35 32 C ..>L.. _1_ TIP I I 1 ~-=-•I"" "' I RING 2ND 5 18 I 2 3 33 30 * I RING I ISTATION * 208 6 19 6 7 8 34 31 I 6 7 20 9 10 II 35 32 T A I

(0) A I * JT 3RO 8 18 I 2 3 33 30 * I I II L I ' I ] 208 9 19 6 7 8 34 31 ~ ~ o 20 9 10 II 35 32 r:J,.-c I L I

: ickG~ * ~c 4 ~ c /L "-' 4 ~~~. 5 ~2 ~ >GM_ : lr--B-~~J -=- - .• 3 2~58~41, .. 1 -=-TOP 75on ~2~ .. ~ -r.:----j

3 ± 5% 3 58 4 I 3 1 r:::\ I

~ _ _ce-J ~c ~c ! lq __ j r-@

r@"c" l../;6\8AT

l@~~·~

~ c

...J 16 C C H D T R 8

--I.L. CD I 23 22 21 20 19 18 17 16 15 13 12 II 10 9 8 7 6 5 3 4 26 I 2 24 14' ...J ...J I

L ..B1

R R R R R R R C C C C C C C C C H A T R =-

27 I

"Z"STRAP I IS REMOVED~ .. TS"A": -v_ 6

5J -o ~ IF WINK .1 I ---,~ . < '--o ~~ fB ~~67" CKT IS ~ I A c A \'o-- 1-::t: "

USED 3 I ~ ~I 1; ~~ t_c

1 S6

L--- _ _!_l ON 204E SELECTOR f;? I 11 '------. C IOO!l A '2 ~ -!-1 rj

TO "C"BAT D LL. a::

(IJ I-.--- r<) 'It

A

-=-8

B ', : ~f~3 5 0 A ~ A-.-_-_ ~~D~..,: -'-- "~'GRD 8 A I LM RLS 10011..- ROT B ~

..--~7~t ,_~ 235 I [) _( ,__.r-<l1~ 4·~ ~"A"BAT -::- 235" 9T ,_ 3T .n H 25 24

a -" .-. I B D ( 70011 - :- 2 "B"GRD B..r: I I M 48'"""-D 8 -=- ~·?

L-.(!8\1--~-_;1- n !SRI I I _r·M~ ...... ,._......,:. ~• ~ LINE4VYil~l .._ 7811 ~ TOP~l I - 68!l '- I .-=o-- ~,1;-

.____.., 17 F 2 2 IB I 21 I 3 Cr:z..~-4-1-11-+-+-o-::~6:...__ AUDIBLE ~ I I :~~~" 5 SIGNAL ~s"C" RD

28 LB :;!;: 8 1;"61 I 31o 4 I r-~11 I"L.:;.. SUPPLY ~

LJNE56LF-'---<f4- -I L.-....::.J,..., r~2t lc h!-' 7T ~ ~ I B-b38~~T ~-~~ 5T ~Q -~~ u2'5000 ~ ~ ~29"B"BAT I ~ 95 n ¥ 19 ·~ ~ t ~ =~-~=r3~"~--~ 207A

LIN1:.6~LF~6 ~ I It 2 2l" I 4>~f'27 28 {29)-=-~KTU TS~212A KTU TS"A" :cll-j

1AUDIBLESIGNAL 3-~8 ~

1 TIMING CKT -=- 8 TO LAMP POWER SUPPLY

0= TERMINALS ON KTU TERMINAL STRIP FIGURE 24

Dial Selective Intercomm-unicating Line Circuit with Flashing Line Lamps-207 A, 208A, a1Ul 212A Key Telephone Units

45

46

208A K TU ®=208 TERMINAL ASSIGNMEN1

STA C STATION LEADS ~----All . LEADS T R A L LG

I ~c ~~~~~ 1ST 2 18 I 2 208 3 19 6 7

I ~~--------~~~~~~~~+7fi+3~S~32~ I RING 3 33 30

4 20 9 10

2ND 5 18 I 2 *P---- 8 34 31 \STATION II 35 32

I (0) A ,' *)----+---. 3 33 30

208 9 19 6 7 20 9 10

3RD 8 18 I 2 8 34 31

I u L * l_c 11 35 32

ll--~~IGJ ~ :t<: I 6~ c=-\oP .r;S~;-

208 9 19 6 7 0 20 9 10

1 B I ..---3-1-<~2::...~~~~' 4 "i 3 ± 5 %

L ___ j

~ c

~JY- c c

~6l_~~~& - - ~~ 25--- '-* -- - - - ! ~4-3~3~1~ 15- 1=- 13 D T R B H

; ~ ~ ;~:;2-;-; 20 1-; 1-;-:; I;~ 13 ;;- 1~1~ g-8-7 _6_5_3_-4 26 ~ 2-;~1.? F\ L -l' R R R R R R R R C C C C C C C C C H A

30

T R -:-

~8621 TO ' "c~BAT D LL

Ll NE I ;:;:;.. LF i I 51 ' 5 cO a: ~5 I v~ L-o~ r- M f-

r A ,.. A "'r' o-c::- '"Bf567 JL <t ~ LB ,.,.4 I 1------n •'- -v I~ AS6lf!

~ '-------.o~~o ~Oil ,.,.o ~o I --~ LINE 2 23 LF h I '-----+ "----+ I 2

26 LB 2 I ON cloonk~~t~ SELECTOR 21 A- ..,. B

LINE32 LF i1 ~--- -l rff~S ~.::--1 k}'0 ,11

::jf ~ c~ ROT ~34.AG~RD 7 • 8 .A. I LM IOO.Il ~

B ~ lgl 9 T I 2 351 B lbij'rt ol S 4~~ 1-<H~~ B ~T 235.n.. ~ 3T .n. , r f' · n 4 ~ ~ ~ H I l SRI ., I _rllli-4RM 1-<;!.00.0.. 3 • 2 25 24G ~

LINE4~F I '--' 7B1 ~ TOP111 - 68Il ~~6 ~37 BB~AT 27 2 - I 2+ I 3 c 4 AUDIBLE ~-

' -. &] •5 SIGNAL " • ~ :;J. B -=-B I _21. "'4 2 _rltr:fi -;-T SUPPLY ~

LINE 5 629 L LFF ~ 4 - ~ I r1. T • I,.,. ,_,, 00 ~39( CJB3AATT ~ ..:h. 3B<j._.l.2_T 81.~~ ~ -= I

5 .ll ~

~ ~ : *B~~~ -f''-~ 3 42

~ 207 A

LINE6*LF ~6 ~ 1 2

• I ~'~9 KTU ~ ~ I .Qtlf-J 9 4 r-=-TS ''/>.:' 209A K TU Ts''s" .,. AUDIBLE siGNAL 3~ -=8

I TIMING C KT TO LAMP POWER SUPPLY

Q= TERMINALS ON KTU TERMINAL STRIP

FIGURE 25 Dial Selective Intercommunicating Line Circuit with Flashing Line Lamps-

207 A, 208A, and 209A Key Telephone Units

~-------------- ---------, I

1

I I I I I I I

I I I I I

SIGNAL LAMPS AT

TELEPHONE SETS

L3~-KTU-

0 (J

1209A KTU-; a 212A KTU

0

I (J

I T.S. '/\"

L

BF

T

A TEL. CKTS. (PICK-UP KEYS) l TO KEYS AND

R INTERCOM ~~--+--+----------~

-::-B

I I I I I I I I I I I I

________ j --------,- --------, I

TO

3BF ~~~

1

I I

NOISE I - SUPPRESSION I

CKT. FOR BATTERY SUPPLY I

USING ANGLE BRACKET KTU

I I L __________ j

~-, 211A KTU- -- -TERMINAL~UMBERS WHEN -;;A KTU- I "B" BAT ~ 1s usED INSTEAD OF 31A KTU a 23A KTU 1

TS"B" TS"A" I ~TOBATTERYSUPPLYFORLAMPS ... I "B"GRD.~

1

1 ~ T ..,. I

(BF)REL ~ R ...-

IO=TERM.PCHGS.ON212AKTU I ~ L .. I 10 48 ~ co .. I =TERM.PCHGS.ON 209A KTU I ~

"B"GND

I ® .. I 5TF "A"GNO TO 8 F 38;)--------___:~:.:.:.:::__ _ _.

I RELAY ~ 40 "A' BAT I I NS NOISE SUPPRESSION CKT. I

I I KS-14136 + FOR BATTERY SUPPLY I

500..U.F 2

L- --- --~~ -- - -- - ---- --·- ---- ··-- -- -·-·- ---- -- _J [I); TERMINALS ON KTU TERMINAL STRIP

FIGURE 26 Intercommunicating Line Battery Feed Circuit-

23A, 31A, 209A, 21IA, and 212A Key Telephone Units

47

48

,--------------------------------, I A 202 B KTU I 3 4 T I I

I 78 H--::~_ R TO :

I TO co B -=- TEL I OR I p B X 7T A SET

I I ~ J I

I 4 I ----o---------------~~ ~ H -=-B 4

I I I I @) "s"BAT

I I @ "s"GRD L ____ -,-----1 @"s"BAT

I 1 @)"s"GRD

1 TS "s"

I I I I I I I L I

I I I 3 I I I I I I I I

(f) ws

3 2 6TR

3BF O=TERM PCHGS ON 202 B KTU

tD.s 2 HA 37)------o--

-------------------~ 8 8 209A KTU

~ : B - I

6

TS"A"

A I 3T I

I I I

I I -=-s

t5 I -------------- ___ j

-------------------, 15 13 210 A KTU @"s"BAT I

2

TOP

@'s"GRDI

8 r---; -- ----~:-01u~E: 6~---------@J I 5 ~- ~---- -~: -0luNE I 3~--------@j 4 I 2~+ -----~w -GJuNE I

I LB ~ 3 ------~ I

I I

W ~ I 1s 1,~ I

9T -=- r _ _!::w --G)~uNE I W NETWORK WT

I I I

I I L B_ I:;) 2

2~===-J--~ LB I

A

2

3

I I 5 I - I L ________________________ ~ 0= TERMINALS ON KTU TERMINAL STRIP

FIGURE 28 Lamp Winking Circuit- 202B, 209A, and 210A Key Telephone Units

L 4

LAMP BAT

TO I TEL I SET I

I I I

I I

49

50

,---- ---------,

1 LAMP RESISTANCE CIRCUIT

WHEN 16- 50V. DC SUPPLY IS USED

I I I I

I

KEY TEL UNITS 22 KEY TEL UNIT I STA~O-; LAMPS I 203A,

204A& 20~A

2.11A

212A & 202B rs'P:'

LINES 1234~6

207A

31A ANGLE

BRACKET

L 17 }--If-=--

LG

L

LG

L

LG

L

LG

L

LG

-=® STATION 2.0R 8

STATION 30R9

}--1-+--+--=....:'---..,C::..,'- STAT ION 4 OR 10

}-If-+--+--=----+-.,.\ STAT 10 N 5 OR II

STATION 60RI2

I

TO LAMP POWER SUPPLY GRD LEAD

____ j

AC SUPPLY FOR LAMPS (9-11 VOLTS)

I CONNECT

TO I0~-125V

I 50-601\..f

SUPPLY

I I I I I I L

393A TRANSFORMER

®=-

GROIN APPARATUS

CABINET

0 =TERMINALS ON KTU TERMINAL STRIP

FIGliRE 29

GRD

+

GRD

+

GRD

± GRD

±

KEY TEL UN ITS

203A, 204A, 205A &211A

31

TO STATION LAMP LG

ANGLE BRACKET

31A

2.07 A 1o 206A

212A TS 'A"&. 202B

39

Lamp Resistance Circuit and AC Supply for Lamps (9 to l I Volts)

I

I

I I I I I I I

I _j

I

I

I I I I I I I

I l_

LAMP RESISTANCe CKT WHEN FLASHING LAMP FEATURE

IS PROVIDED

208A KEY TEL UNITS ,-----, I STATION LAMPS

C KT L I

">--1---1---=L=----.,<::; s TA Tl 0 N I

1ST 208

CKT 2

I ST 208

CKT 3

1ST 208

CKT 4

2ND 208 30

LG

L

LG

A3 L

LG

L

LG

PART OF IOIG POWER PLANT

OUT + 11-

I __ _ _ _ _ _ ~ G R D

I I

I B G/ B G + G + G

0 cr-o-o.-- -o Cf- -o-o '-...,-20V DC_/ "-.:.zov DC_/ ~ IOV -::__/ "'---= ISV ~

TALK SIG AC AC

1 1 i i

/ DIAL INTERCOM "-. SELECTOR CIRCUIT

RELAY SUPPLY

/.fALKJ-NG CIRCUIT i' RELAY SUPPLY

i i /LAMP

POWER SUPPLY

y,. LOCAL GRD

i i /BuzZER'­

SUPPLY

I OR 5 I OR 9

STATION I 2 OR 6 I

STATION I 30R 7 I

STATION

1

1 4 OR8

___ j

20~

RING SUPPLY FOR BELLS

0= TERMINALS ON K TU TERMINAL STRIP

FIGURE 30 Lamp Resistance Circuit When Flashing Lamp Feature is Provided-

101 G Power Supply Connections

I I

I I I I I I

I I I I I I 1

I

I I I I I· I I I I I I I

_j

51

52

,----------------~------ ---1 202B KTU t212A KTU I II I ISTLINE I I I 4 I T I TO I I 31 T 3 + j I BT:s~!~IONI II TO A I I BRIDGE I

CENTRAL I I RINGER I

I o~rdcE 2 R I I

PBX LINE (- ?T "A' LEAD - ,-/ I I MAX 2 HIGH I

32 L_R -) soon 1 1 IMPEDANCE I I CKT r- 79 ~~~

I 0 _L I LPER LINE

I - B -=- I - -~

I I I I NOTE I

IQ=TERM 3.1. II I I PCHGS ~ 4

ON 2028 ----~--------~34 I I I KTU I 1 I PF I I LINE I

: ~~~------------~~~-3-3:::===T~T-1

: ~· ~: : I H I ®-----! I I I 6TRr- I ~0 -s I I S-93 ~4BR I I I n STF I @-------,I I I 3BF<=pP-93!l I ~2 -6 I I I - I 13T I I ..-----~) 7oon I I I _ 139 H:-l 1

I I ~~ '---i-+-1-R .. ~8 ~4- I l's"sAT~ ~ I Rl @------J 1

i"B'GRD~ ~ : ~D-5 I

A316A I §------J I

VARISTOR II f--1 ______ T_O _________ _j ~o 2-6

T s ''A'' @--------J I

I "a" BAT+@)

I 1 "s"GRD+@)

I I I I

4

B~L3~--------~

rs"c"

L ____________________________ J 0= TERMINALS ON KTU TERMINAL STRIP

FIGURE 31 Power Failure Circuit- 2028, and 212A Key Telephone Units

r----------------~------~---~ I 202 B K TU I 209A K TtJ I I I ISTLINE I I I

4 I I T TO I ,/ I I T TEL

TO CENTRAL

OFFICE OR

PBX LINE CKT

T 3 + I -1- STATION! 31

A I : B:BRIDGE II I I RINGER

2 R I r- 7T

11A1

LEAD 1

NOTE

O=TERM PCHGS

ON 2028 KTU

<r-t--. soon I 1 MAX.2 HIGH 1

"--l-v7_B-IIIL.... I 1 IMPEDANCE I ' I P. j_ PF LPER LINE

'-- B-=- I ~6 LINE NO--i

I ~-3 1

I ~4 I I ~-2 I 4

33.>-t-I_T_I..,. ~~ 2 I I ......,-+------+-+--+---+: __ r... -I 1 I I

I I ~. 1

I I ~8

-4

ALL PCHGS II

I H I ~I ONTS"B" 0 EXCEPT CKT II

I I &CKT2 6TR- -S WHICH AP-E I

I S-93 4BR I ~I ONTS"A" il 5TF I I

1 12 I 3 BF(_)P-93 il I -6 I

-I I 13T r- I 1 1 .-----+--+-IJ 1o on 1

I I c_I3B llh I

I I ~~3- I J"s"sAr---@ ~ : ~6

I I"B"GRD+@) ~ I ~0

3

R 4-2 :

~------VA~-~~~-~-R-----1---J 4~~- I I

Rl Rl 2 -I I TS "s" TO ...__ __ ;--_,. 36 I

: "B' BAT+@ 4 ~8 ~~. I I"B"GRD+@ B~._3 _________ ___J 9 R I

I ~o5 I ~I I

I HA--...,., PI R 6 I I 5 T F 't--lt---...-tll b

TO B- 2 I I I L ________________________ J 0= TERMINALS ON KTU TERMINAIJ STRIP

FIGURE 32 Power Failure Circuit- 2028, and 209A Key Telephone Units

•

53

54

~-----------------~

I I

I I

I

I I I

I

I

I

I

RINGER CKT

(COMMON)

BUZZER CKT

(COMMON)

7A BUZZER-270 .n. I I

687AW3 SUBSET

L2

OR 7 A 8 C: L L -2 4 7. 8 .ll.

® > R OR Rl I

0.5 i.LF

ROR Rl

BORBI

A

~

(

'0 D

'--'

~

>---) £ B OR Bl

L---

Ll w v

WIRING AC OPERATION WIRING DC OPERATION

NOISE SUPPRESSION CKT. FOR BATTERY SUPPLY

211A KTU OR 23A KTU USING ANGLE BRACKET

r-----------------~GV~--------~B~A~T

i NS CONNECT ACROSS KS-14136 DC SUPPLY

~~-------5-o_o __ ~--F--~GV~---------G_R_o "A" BAT & GRD

LAMP CKT

L

--~L~G _______ c=Ji) TERMINAL NUMBERS

211A 23A

BAT @ 0 LINE S BUSY

GRO. @ CD

I I I I I I I I I I I I I

I

I I I

L __

I

I I I I I I

~------- ____________ _j 0 =TERMINALS ON K TU TERMINAL STRIP

FIGURE 33 Ringer, Buzzer, and Noise Suppression Circuit for Battery Supply A

I I I I TO TIE

LINE CKT IAT DISTANT

KEY TEL I SYSTEM

I I I I I

105V ± 5)-----~

I OR 36)----r--.

Rl NGER ~

BUZZ ER SUPPLY

3

Rl 4

I I I

TO SET

R 32\----l---,2,0

TOP

5

~ T~O R R~ELAY \_____/ "--../ -1- 23 27

"-. R R R/

L ____ _ TO COM.AUD.

SIG. CONTCKT ,---1

I I I I

I I

I I

8 B

3 2

T 5

':A'

TOP

.. t..

22

0 u

LAMP BAT

SUPPLY 31

~1111 VA-BAT

@A'~GRD

@'8'~8AT

@'B"GRD

I I

I I

_____ _j

212A KTU- -l

TO

5TF

2

I @'s"8AT I M''8

11

GRD I ~ TS"A"

I I

z r--~--111~ ~ ~'z" STRAP IS REMOVED -::- 8

IF WINK CKT IS USED.

I 7+ I ~ ~~9~T _______________ +---r-+---Q I -78 235fl LINE

_ ~NO I 8I 2Y==:- LF ® -4

J= ~ ~~ c I 4~~-_,

I .. hE3ifcl\ I 6~~-6 '----=........@ II II L ______ _:J"_S~

L8

LF

_________ _j

0= TERMINALS ON KTU TERMINAL STRIP

FIGURE 34 Ringdown Tie Line Circuit- 204A and 212A Key Telephone Units

55

56

I I I I I TO TIE I LINE CKT

'

AT DISTANT KEY TEL

I SYSTEM

I I I

--T

~~~--~-....----4 TB 204A KTU

4

TO TEL SET

I 105V ± 5 1---'-------' ~-------+~------+---------~~~17

I I I I I

RINGER OR

BUZZER SUPPLY

I TO SET

4 Rl

3

-8

~ TORRELAY

_ A ~ 25

I - ":/-( ~R/ ~ TO COMAUD.

L - - ---- ~G~ONTCKT -

I I I I I I I

B

I~ I

1t LFg- 3

8 'eJ TS"A'

LB

LF

2

-8

0= TERMINALS ON KTU TERMINAL STRIP

FIGURE 35

2 TOP

TO

A

5 ~ TO I 7 13 SIGNAL!

KEY I

LAMP BAT 31

SUPPLY

I I I I

209A

5TF

~1111 "-:::J A- BAT

@'A~GRD

@"s'~BAT

@"s'~GRD

I I I

____ _j

KTU --l I

@'s"sAT I M"s"GRD I vTs"s" 1

3BF II~ I 78

2 I I I I I I I I I I I I I

__________ _j

Ringdown Tie Line Circuit- 204A and 209A Key Telephone Units

~----- ---RINGING LAMP CKT-- ------------­USING ANGLE BRACKET

<.!>>­z...l _a.

KEY TELEPHONE UNIT

RING GRD

I05V±

RING GRD

105V±

RING GRD

105V±

KEY TELEPHONE UNITS

TO AUDIBLE 51 NAL

ANGLE BRACKET MOUNTED

16A

205 A

204A

O<.!>a. t-z:J I irl/) RING GRD

212A T.S."A" 202 B I

I I I I I I I I I I I I I I I I I

105V±

IIA KTU RINCGRD

AC SUPPLY FOR BUZZERS (15-25 VOLTS)

KS -5714 C..3 I AMP TRANSfORMER

GRD IN APPARATUS CABINET

~II 0---2 5 v--4----=---i+ *·~ CONNECTS TO

105-125V 50-60 fV

SUPPLY

®=TERMINAL PUNCHINGS ON TABLE

203A

203A 204A&205A

211 A

AUDIBLE SIGNAL

ANGLE BRACKET MOUNTED

16A

212A T.S."A" 202B

207A

I __ _ I

__________ ! O=TERMINALS ON KTU TERMINAL STRIP

FIGURE 36 Ringing Lamp Circuit and AC Supply for Buzzers (15 to 25 Volts)­

llA Key Telephone Unit and KS-5714, L3 Transformer

57

58

r--+--------'-98

-:= J 6 TR 5 BF

,------------I I I I I I B 8

I l:r! 9T

I -=- 78 235Il. LINE

I~ Is-::-2~1 F -4

I =;c L_ ~B@ I 4r------~- 5 I -@

2

H II

TS A

--/-----:--,

TO @"s"BAT I I

~"B"GRD v TS"A"

I I I j

3BF ~~~ -=-B

I I I I

.. I I I I

I ~ .,._L_B __ _,

L_ _:~s~F®~s6"s"_ ~--- _________ ~~~-A-::~ I I

__j 0= TERMINALS ON KTU TERMINAL STRIP

FIGURE 37 Station Line Circuit-205A and 212A Key Telephone Units

j

\

\

_/ t'